Представляю вам несколько, как я их назвал, "вкусняшек" на html5 и css с исходным кодом, которые пригодятся при разработке дизайна и вёрстке сайтов. Вы можете скачать CSS стили и использовать эти разработки в своих проектах. Уверен, они украсят дизайн страниц ваших сайтов и придадут им динамичность.

1. Слайдер изображений на CSS

HTML

<ul class="slides">
    <input type="radio" name="radio-btn" id="img-1" checked />
    <li class="slide-container">
    <div class="slide">
      <img src="http://farm9.staticflickr.com/8072/8346734966_f9cd7d0941_z.jpg" />
        </div>
    <div class="nav">
      <label for="img-6" class="prev">&#x2039;</label>
      <label for="img-2" class="next">&#x203a;</label>
    </div>
    </li>

    <input type="radio" name="radio-btn" id="img-2" />
    <li class="slide-container">
        <div class="slide">
          <img src="http://farm9.staticflickr.com/8504/8365873811_d32571df3d_z.jpg" />
        </div>
    <div class="nav">
      <label for="img-1" class="prev">&#x2039;</label>
      <label for="img-3" class="next">&#x203a;</label>
    </div>
    </li>

    <input type="radio" name="radio-btn" id="img-3" />
    <li class="slide-container">
        <div class="slide">
          <img src="http://farm9.staticflickr.com/8068/8250438572_d1a5917072_z.jpg" />
        </div>
    <div class="nav">
      <label for="img-2" class="prev">&#x2039;</label>
      <label for="img-4" class="next">&#x203a;</label>
    </div>
    </li>

    <input type="radio" name="radio-btn" id="img-4" />
    <li class="slide-container">
        <div class="slide">
          <img src="http://farm9.staticflickr.com/8061/8237246833_54d8fa37f0_z.jpg" />
        </div>
    <div class="nav">
      <label for="img-3" class="prev">&#x2039;</label>
      <label for="img-5" class="next">&#x203a;</label>
    </div>
    </li>

    <input type="radio" name="radio-btn" id="img-5" />
    <li class="slide-container">
        <div class="slide">
          <img src="http://farm9.staticflickr.com/8055/8098750623_66292a35c0_z.jpg" />
        </div>
    <div class="nav">
      <label for="img-4" class="prev">&#x2039;</label>
      <label for="img-6" class="next">&#x203a;</label>
    </div>
    </li>

    <input type="radio" name="radio-btn" id="img-6" />
    <li class="slide-container">
        <div class="slide">
          <img src="http://farm9.staticflickr.com/8195/8098750703_797e102da2_z.jpg" />
        </div>
    <div class="nav">
      <label for="img-5" class="prev">&#x2039;</label>
      <label for="img-1" class="next">&#x203a;</label>
    </div>
    </li>

    <li class="nav-dots">
      <label for="img-1" class="nav-dot" id="img-dot-1"></label>
      <label for="img-2" class="nav-dot" id="img-dot-2"></label>
      <label for="img-3" class="nav-dot" id="img-dot-3"></label>
      <label for="img-4" class="nav-dot" id="img-dot-4"></label>
      <label for="img-5" class="nav-dot" id="img-dot-5"></label>
      <label for="img-6" class="nav-dot" id="img-dot-6"></label>
    </li>
</ul>

CSS стили

.slides {
    padding: 0;
    width: 609px;
    height: 420px;
    display: block;
    margin: 0 auto;
    position: relative;
}

.slides * {
    user-select: none;
    -ms-user-select: none;
    -moz-user-select: none;
    -khtml-user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}

.slides input { display: none; }

.slide-container { display: block; }

.slide {
    top: 0;
    opacity: 0;
    width: 609px;
    height: 420px;
    display: block;
    position: absolute;

    transform: scale(0);

    transition: all .7s ease-in-out;
}

.slide img {
    width: 100%;
    height: 100%;
}

.nav label {
    width: 200px;
    height: 100%;
    display: none;
    position: absolute;

    opacity: 0;
    z-index: 9;
    cursor: pointer;

    transition: opacity .2s;

    color: #FFF;
    font-size: 156pt;
    text-align: center;
    line-height: 380px;
    font-family: "Varela Round", sans-serif;
    background-color: rgba(255, 255, 255, .3);
    text-shadow: 0px 0px 15px rgb(119, 119, 119);
}

.slide:hover + .nav label { opacity: 0.5; }

.nav label:hover { opacity: 1; }

.nav .next { right: 0; }

input:checked + .slide-container  .slide {
    opacity: 1;

    transform: scale(1);

    transition: opacity 1s ease-in-out;
}

input:checked + .slide-container .nav label { display: block; }

.nav-dots {
  width: 100%;
  bottom: 9px;
  height: 11px;
  display: block;
  position: absolute;
  text-align: center;
}

.nav-dots .nav-dot {
  top: -5px;
  width: 11px;
  height: 11px;
  margin: 0 4px;
  position: relative;
  border-radius: 100%;
  display: inline-block;
  background-color: rgba(0, 0, 0, 0.6);
}

.nav-dots .nav-dot:hover {
  cursor: pointer;
  background-color: rgba(0, 0, 0, 0.8);
}

input#img-1:checked ~ .nav-dots label#img-dot-1,
input#img-2:checked ~ .nav-dots label#img-dot-2,
input#img-3:checked ~ .nav-dots label#img-dot-3,
input#img-4:checked ~ .nav-dots label#img-dot-4,
input#img-5:checked ~ .nav-dots label#img-dot-5,
input#img-6:checked ~ .nav-dots label#img-dot-6 {
  background: rgba(0, 0, 0, 0.8);
}

DEMO

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2. Градиентная фоновая анимация на чистом CSS

HTML

<div class="gradient-background">
  <div class="d-flex flex-column justify-content-center w-100 h-100">
     <div class="d-flex flex-column justify-content-center align-items-center">
       <h1 class="fw-light text-white m-0">Pure CSS Gradient Background Animation</h1>
       <div class="btn-group my-5">
          <a href="#" class="btn btn-outline-light" aria-current="page"><i class="fas fa-file-download me-2"></i> Какая-то кнопка </a>
          <a href="#" class="btn btn-outline-light">Ещё кнопка <i class="fas fa-expand ms-2"></i></a>
       </div>
     </div>
   </div>
 </div>

CSS

.gradient-background {
     background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
     background-size: 400% 400%;
     animation: gradient 15s ease infinite;
     height: 100vh;
}

@keyframes gradient {
  0% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
  100% {
    background-position: 0% 50%;
  }
}

DEMO

3. Раскладное Меню-гамбургер на CSS

HTML

<nav role="navigation">
  <div id="menuToggle">
    <!--
    A fake / hidden checkbox is used as click reciever,
    so you can use the :checked selector on it.
    -->
    <input type="checkbox" />
    
    <!--
    Some spans to act as a hamburger.
    
    They are acting like a real hamburger,
    not that McDonalds stuff.
    -->
    <span></span>
    <span></span>
    <span></span>
    
    <!--
    Too bad the menu has to be inside of the button
    but hey, it's pure CSS magic.
    -->
    <ul id="menu">
      <a href="#"><li>Home</li></a>
      <a href="#"><li>About</li></a>
      <a href="#"><li>Info</li></a>
      <a href="#"><li>Contact</li></a>
      <a href="https://erikterwan.com/" target="_blank"><li>Show me more</li></a>
    </ul>
  </div>
</nav>

CSS

#menuToggle
{
  display: block;
  position: relative;
  top: 50px;
  left: 50px;
  
  z-index: 1;
  
  -webkit-user-select: none;
  user-select: none;
}

#menuToggle a
{
  text-decoration: none;
  color: #232323;
  
  transition: color 0.3s ease;
}

#menuToggle a:hover
{
  color: tomato;
}


#menuToggle input
{
  display: block;
  width: 40px;
  height: 32px;
  position: absolute;
  top: -7px;
  left: -5px;
  
  cursor: pointer;
  
  opacity: 0; /* hide this */
  z-index: 2; /* and place it over the hamburger */
  
  -webkit-touch-callout: none;
}

/*
 * Just a quick hamburger
 */
#menuToggle span
{
  display: block;
  width: 33px;
  height: 4px;
  margin-bottom: 5px;
  position: relative;
  
  background: #cdcdcd;
  border-radius: 3px;
  
  z-index: 1;
  
  transform-origin: 4px 0px;
  
  transition: transform 0.5s cubic-bezier(0.77,0.2,0.05,1.0),
              background 0.5s cubic-bezier(0.77,0.2,0.05,1.0),
              opacity 0.55s ease;
}

#menuToggle span:first-child
{
  transform-origin: 0% 0%;
}

#menuToggle span:nth-last-child(2)
{
  transform-origin: 0% 100%;
}

/* 
 * Transform all the slices of hamburger
 * into a crossmark.
 */
#menuToggle input:checked ~ span
{
  opacity: 1;
  transform: rotate(45deg) translate(-2px, -1px);
  background: #232323;
}

/*
 * But let's hide the middle one.
 */
#menuToggle input:checked ~ span:nth-last-child(3)
{
  opacity: 0;
  transform: rotate(0deg) scale(0.2, 0.2);
}

/*
 * Ohyeah and the last one should go the other direction
 */
#menuToggle input:checked ~ span:nth-last-child(2)
{
  transform: rotate(-45deg) translate(0, -1px);
}

/*
 * Make this absolute positioned
 * at the top left of the screen
 */
#menu
{
  position: absolute;
  width: 300px;
  margin: -100px 0 0 -50px;
  padding: 50px;
  padding-top: 125px;
  
  background: #ededed;
  list-style-type: none;
  -webkit-font-smoothing: antialiased;
  /* to stop flickering of text in safari */
  
  transform-origin: 0% 0%;
  transform: translate(-100%, 0);
  
  transition: transform 0.5s cubic-bezier(0.77,0.2,0.05,1.0);
}

#menu li
{
  padding: 10px 0;
  font-size: 22px;
}

/*
 * And let's slide it in from the left
 */
#menuToggle input:checked ~ ul
{
  transform: none;
}

DEMO

4. Lightbox на чистом CSS

HTML

<!-- thumbnail image wrapped in a link -->
<a href="#img1">
  <img src="https://picsum.photos/seed/9/500/300">
</a>

<!-- lightbox container hidden with CSS -->
<a href="#" class="lightbox" id="img1">
  <span style="background-image: url('https://picsum.photos/seed/9/900/450')"></span>
</a>

CSS

.lightbox {
  /* Default to hidden */
  display: none;

  /* Overlay entire screen */
  position: fixed;
  z-index: 999;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  
  /* A bit of padding around image */
  padding: 1em;

  /* Translucent background */
  background: rgba(0, 0, 0, 0.8);
}

/* Unhide the lightbox when it's the target */
.lightbox:target {
  display: block;
}

.lightbox span {
  /* Full width and height */
  display: block;
  width: 100%;
  height: 100%;

  /* Size and position background image */
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
}

DEMO

Кликните по изображению

5. Checkboxes на CSS

HTML

<ul class="unstyled centered">
  <li>
    <input class="styled-checkbox" id="styled-checkbox-1" type="checkbox" value="value1">
    <label for="styled-checkbox-1">Checkbox</label>
  </li>
  <li>
    <input class="styled-checkbox" id="styled-checkbox-2" type="checkbox" value="value2" checked>
    <label for="styled-checkbox-2">CSS Only</label>
  </li>
  <li>
    <input class="styled-checkbox" id="styled-checkbox-3" type="checkbox" value="value3" disabled>
    <label for="styled-checkbox-3">A disabled checkbox</label>
  </li>
  <li>
    <input class="styled-checkbox" id="styled-checkbox-4" type="checkbox" value="value4">
    <label for="styled-checkbox-4">Fourth option</label>
  </li>
</ul>

CSS

.styled-checkbox {
  position: absolute; // take it out of document flow
  opacity: 0; // hide it

  & + label {
    position: relative;
    cursor: pointer;
    padding: 0;
  }

  // Box.
  & + label:before {
    content: '';
    margin-right: 10px;
    display: inline-block;
    vertical-align: text-top;
    width: 20px;
    height: 20px;
    background: white;
  }

  // Box hover
  &:hover + label:before {
    background: #f35429;
  }
  
  // Box focus
  &:focus + label:before {
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.12);
  }

  // Box checked
  &:checked + label:before {
    background: #f35429;
  }
  
  // Disabled state label.
  &:disabled + label {
    color: #b8b8b8;
    cursor: auto;
  }

  // Disabled box.
  &:disabled + label:before {
    box-shadow: none;
    background: #ddd;
  }

  // Checkmark. Could be replaced with an image
  &:checked + label:after {
    content: '';
    position: absolute;
    left: 5px;
    top: 9px;
    background: white;
    width: 2px;
    height: 2px;
    box-shadow: 
      2px 0 0 white,
      4px 0 0 white,
      4px -2px 0 white,
      4px -4px 0 white,
      4px -6px 0 white,
      4px -8px 0 white;
    transform: rotate(45deg);
  }
}

DEMO

6. Обводка блока (кнопки) с анимацией на CSS

HTML

<section class="buttons">
  <button class="draw">Draw</button>

  <button class="draw meet">Draw Meet</button>

  <button class="center">Center</button>

  <button class="spin">Spin</button>

  <button class="spin circle">Spin Circle</button>

  <button class="spin thick">Spin Thick</button>
</section>

CSS

button {
  background: none;
  border: 0;
  box-sizing: border-box;
  margin: 1em;
  padding: 1em 2em;
  
  // Using inset box-shadow instead of border for sizing simplicity
  box-shadow: inset 0 0 0 2px $red;
  color: $red;
  font-size: inherit;
  font-weight: 700;

  // Required, since we're setting absolute on pseudo-elements
  position: relative;
  vertical-align: middle;

  &::before,
  &::after {
    box-sizing: inherit;
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
  }
}

.draw {
    transition: color 0.25s;

  &::before,
  &::after {
    // Set border to invisible, so we don't see a 4px border on a 0x0 element before the transition starts
    border: 2px solid transparent;
    width: 0;
    height: 0;
  }

  // This covers the top & right borders (expands right, then down)
  &::before {
    top: 0;
    left: 0;
  }

  // And this the bottom & left borders (expands left, then up)
  &::after {
    bottom: 0;
    right: 0;
  }
  
  &:hover {
    color: $cyan;
  }

  // Hover styles
  &:hover::before,
  &:hover::after {
    width: 100%;
    height: 100%;
  }

  &:hover::before {
    border-top-color: $cyan; // Make borders visible
    border-right-color: $cyan;
    transition:
      width 0.25s ease-out, // Width expands first
      height 0.25s ease-out 0.25s; // And then height
  }

  &:hover::after {
    border-bottom-color: $cyan; // Make borders visible
    border-left-color: $cyan;
    transition:
      border-color 0s ease-out 0.5s, // Wait for ::before to finish before showing border
      width 0.25s ease-out 0.5s, // And then exanding width
      height 0.25s ease-out 0.75s; // And finally height
  }
}

// Inherits from .draw
.meet {
  
  &:hover {
    color: $yellow;
  }

  // Start ::after in same position as ::before
  &::after {
    top: 0;
    left: 0;
  }

  // Change colors
  &:hover::before {
    border-top-color: $yellow;
    border-right-color: $yellow;
  }

  &:hover::after {
    border-bottom-color: $yellow;
    border-left-color: $yellow;
    transition: // Animate height first, then width
      height 0.25s ease-out,
      width 0.25s ease-out 0.25s;
  }

}

// Does not inherit
.center {
  &:hover {
    color: $purple;
  }

  // Set up base styles, we're going to scale instead of animating width/height
  &::before,
  &::after {
    top: 0;
    left: 0;
    height: 100%;
    width: 100%;
    transform-origin: center; // Ensure scaling is done from the center (expands outwards)
  }

  // scale3d(<scale-horizontal>, <scale-vertical>, <scale-depth>);
  &::before {
    border-top: 2px solid $purple;
    border-bottom: 2px solid $purple;
    transform: scale3d(0,1,1); // Shrink only width
  }

  &::after {
    border-left: 2px solid $purple;
    border-right: 2px solid $purple;
    transform: scale3d(1,0,1); // Shrink only height
  }

  &:hover::before,
  &:hover::after {
    transform: scale3d(1,1,1); // Show full-size
    transition: transform 0.5s;
  }
}

// Border spins around element
// ::before holds three borders that appear separately, one at a time
// ::after holds one border that spins around to cover ::before's borders, making their appearance seem smooth

.spin {
  width: 5em;
  height: 5em;
  padding: 0;
  
  &:hover {
    color: $blue;
  }

  &::before,
  &::after {
    top: 0;
    left: 0;
  }

  &::before {
    border: 2px solid transparent; // We're animating border-color again
  }

  &:hover::before {
    border-top-color: $blue; // Show borders
    border-right-color: $blue;
    border-bottom-color: $blue;

    transition:
      border-top-color 0.15s linear, // Stagger border appearances
      border-right-color 0.15s linear 0.10s,
      border-bottom-color 0.15s linear 0.20s;
  }

  &::after {
    border: 0 solid transparent; // Makes border thinner at the edges? I forgot what I was doing
  }

  &:hover::after {
    border-top: 2px solid $blue; // Shows border
    border-left-width: 2px; // Solid edges, invisible borders
    border-right-width: 2px; // Solid edges, invisible borders
    transform: rotate(270deg); // Rotate around circle
    transition:
      transform 0.4s linear 0s,
      border-left-width 0s linear 0.35s; // Solid edge post-rotation
  }
}

.circle {
  border-radius: 100%;
  box-shadow: none;
    
  &::before,
  &::after {
    border-radius: 100%;
  }
}

.thick {
  color: $red;

  &:hover {
    color: #fff;
    font-weight: 700;
  }

  &::before {
    border: 2.5em solid transparent;
    z-index: -1;
  }

  &::after {
    mix-blend-mode: color-dodge;
    z-index: -1;
  }

  &:hover::before {
    background: $red;
    border-top-color: $red;
    border-right-color: $red;
    border-bottom-color: $red;
    transition:
      background 0s linear 0.4s,
      border-top-color 0.15s linear,
      border-right-color 0.15s linear 0.15s,
      border-bottom-color 0.15s linear 0.25s;
  }

  &:hover::after {
    border-top: 2.5em solid $red;
    border-left-width: 2.5em;
    border-right-width: 2.5em;
  }
}

/* Page styling */

html {
  background: $background;
}

body {
  background: $background;
  color: $text;
  font: 300 24px/1.5 Lato, sans-serif;
  margin: 1em auto;
  max-width: 36em;
  padding: 1em 1em 2em;
  text-align: center;
}

.buttons {
  isolation: isolate;
}

DEMO

7. INPUT как на сайте Google 

HTML

<form>
    
    <div class="group">      
      <input type="text" required>
      <span class="highlight"></span>
      <span class="bar"></span>
      <label>Name</label>
    </div>
      
    <div class="group">      
      <input type="text" required>
      <span class="highlight"></span>
      <span class="bar"></span>
      <label>Email</label>
    </div>
    
  </form>

CSS

.group        { 
  position:relative; 
  margin-bottom:45px; 
}
input         {
  font-size:18px;
  padding:10px 10px 10px 5px;
  display:block;
  width:300px;
  border:none;
  border-bottom:1px solid #757575;
}
input:focus     { outline:none; }

/* LABEL ======================================= */
label          {
  color:#999; 
  font-size:18px;
  font-weight:normal;
  position:absolute;
  pointer-events:none;
  left:5px;
  top:10px;
  transition:0.2s ease all; 
  -moz-transition:0.2s ease all; 
  -webkit-transition:0.2s ease all;
}

/* active state */
input:focus ~ label, input:valid ~ label    {
  top:-20px;
  font-size:14px;
  color:#5264AE;
}

/* BOTTOM BARS ================================= */
.bar  { position:relative; display:block; width:300px; }
.bar:before, .bar:after   {
  content:'';
  height:2px; 
  width:0;
  bottom:1px; 
  position:absolute;
  background:#5264AE; 
  transition:0.2s ease all; 
  -moz-transition:0.2s ease all; 
  -webkit-transition:0.2s ease all;
}
.bar:before {
  left:50%;
}
.bar:after {
  right:50%; 
}

/* active state */
input:focus ~ .bar:before, input:focus ~ .bar:after {
  width:50%;
}

/* HIGHLIGHTER ================================== */
.highlight {
  position:absolute;
  height:60%; 
  width:100px; 
  top:25%; 
  left:0;
  pointer-events:none;
  opacity:0.5;
}

/* active state */
input:focus ~ .highlight {
  -webkit-animation:inputHighlighter 0.3s ease;
  -moz-animation:inputHighlighter 0.3s ease;
  animation:inputHighlighter 0.3s ease;
}

/* ANIMATIONS ================ */
@-webkit-keyframes inputHighlighter {
  from { background:#5264AE; }
  to  { width:0; background:transparent; }
}
@-moz-keyframes inputHighlighter {
  from { background:#5264AE; }
  to  { width:0; background:transparent; }
}
@keyframes inputHighlighter {
  from { background:#5264AE; }
  to  { width:0; background:transparent; }
}

DEMO