CSS Download Button

.buttonDownload {
 display: inline-block;
 position: relative;
 padding: 10px 25px;
  
 background-color: #4CC713;
 color: white;
  
 font-family: sans-serif;
 text-decoration: none;
 font-size: 0.9em;
 text-align: center;
 text-indent: 15px;
}

.buttonDownload:hover {
 background-color: #333;
 color: white;
}

.buttonDownload:before, .buttonDownload:after {
 content: ' ';
 display: block;
 position: absolute;
 left: 15px;
 top: 52%;
}

/* Download box shape  */
.buttonDownload:before {
 width: 10px;
 height: 2px;
 border-style: solid;
 border-width: 0 2px 2px;
}

/* Download arrow shape */
.buttonDownload:after {
 width: 0;
 height: 0;
 margin-left: 3px;
 margin-top: -7px;
  
 border-style: solid;
 border-width: 4px 4px 0 4px;
 border-color: transparent;
 border-top-color: inherit;
 
 animation: downloadArrow 2s linear infinite;
 animation-play-state: paused;
}

.buttonDownload:hover:before {
 border-color: #4CC713;
}

.buttonDownload:hover:after {
 border-top-color: #4CC713;
 animation-play-state: running;
}

/* keyframes for the download icon anim */
@keyframes downloadArrow {
 /* 0% and 0.001% keyframes used as a hackish way of having the button frozen on a nice looking frame by default */
 0% {
  margin-top: -7px;
  opacity: 1;
 }
 
 0.001% {
  margin-top: -15px;
  opacity: 0;
 }
 
 50% {
  opacity: 1;
 }
 
 100% {
  margin-top: 0;
  opacity: 0;
 }
}

<a href="#" class="buttonDownload">Download</a>

source

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