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              <section class="header">
  <h1>CSS Sprite Sheet Animations - Explained</h1>
  <div class="credits">
    <p>Sprite sheet by <a href="https://www.mozilla.org/en-US/firefox/partners/">Mozilla</a></p>
    <p>Demonstration by <a href="https://codepen.io/birjolaxew">Birjolaxew</a></p>
  </div>
</section>

<div class="content">
  <div class="viewport anim steps speed no-border no-shadow"></div>
  <p>Animated sprite sheets are quite simple. Here's how they're done:</p>
  
  <p>You start off with a "viewport". This is simply the element that you want the image to be seen in.</p>
  <div class="viewport no-bg"></div>
  
  <p>Next thing you do is set a <code>background-image</code> for the viewport (translucent image is not visible) to the <a href="https://www.mozilla.org/media/img/firefox/partners/foxtail.png">sprite sheet you want to use</a>.</p>
  <div class="no-shadow-left viewport"></div>
  
  <p>Now to the nifty stuff!</p>
  <p>Let <code>[anim-width]</code> be image width minus the width of your starting frame.</p>
  <p>Set the <code>background-position</code> of the viewport to animate from <code>0 0</code> to <code>-[anim-width] 0</code>.</p>
  <p>This animates from the left side of the first frame, to the left side of the last frame.</p>
  <div class="anim viewport"></div>
    
  <p>Change the <code>animation-timing-function</code> to <code>steps([number-of-frames])</code>.</p>
  <p>This moves the background image one frame at a time.</p>
  <div class="viewport anim steps"></div>
  
  <p>Ramp down <code>animation-duration</code> to speed up the animation.</p>
  <div class="viewport anim steps speed"></div>
  
  <p>And you're done!</p>
  <div class="example container"></div>
  
  <p>This was done with a horizontal sprite sheet - if you're using a vertical sprite sheet, simply animate the <code>y</code> position of the background instead of the <code>x</code> position.</p>
</div>
            
          
!
            
              @import url(https://fonts.googleapis.com/css?family=Ubuntu:300,400,500,700);

/* Actual content stuff! */
.viewport {
  margin:0 auto 50px;
  height:156px;
  width:156px;
  background:#262729 url(https://www.mozilla.org/media/img/firefox/partners/foxtail.png);
  position:relative;
  border: 4px solid #da4e48;
}
.viewport::before, .viewport::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 7020px;
  background: inherit;
  z-index: -1;
  opacity: .2;
}
.viewport::after { left: initial; right: 0; }

.no-bg { background-image: none; }
.no-shadow::before, .no-shadow::after, .no-shadow-left::after { content: initial; }
.no-border { border: none; }
.anim { animation: animate 44s linear infinite; }
.steps { animation-timing-function: steps(44); }
.speed { animation-duration: 3.75s; }

@keyframes animate {  
    0% {background-position: 0 0; }
    100% {background-position: -6864px 0;}
}

/* STYLE */
html, body {
  margin:0;
  padding:0;
  height:100%;
  background:#262729;
  overflow-x:hidden;
}
.header {
  height:50px;
  margin-bottom:40px;
  font-family:"Ubuntu", sans-serif;
  font-weight:500;
  color:#b4b4b4;
}
.header h1 {
  width:480px;
  height:100%;
  z-index:13;
  
  margin:0 auto;
  padding:20px 0 0;
  
  font-weight:500;
  text-align:center;
  
  box-shadow:inset 0 -4px #da4e48;
}
.header .credits {
  width:220px;
  
  margin:0;
  position:fixed;
  top:15px;
  right:35px;
  
  font-weight:700;
  color:#676767;

  z-index:15;
}
.credits p {
  margin:0;
}
a {
  color:#88d;
}
.content {
  font-family:"Ubuntu", sans-serif;
  font-weight:400;
  color:#ddd;
  z-index:5;
  position:relative;
}
.content p {
  text-align:center;
}
code {
  font-style:italic;
}
            
          
!
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