.html:
 
<a href="http://www.ellsworthcreations.com/computers/RESUME_Software_Testing_Resume.pdf"
              class="buttonDownload" target="_blank">Download Resume</a>




.scss: 

.buttonDownload {
    font-family: Roboto,Helvetica Neue,sans-serif;
    border-radius: 4px;
    display: inline-block;
    position: relative;
    padding: 8px 23px;
    margin-left: 5px;
  
    background-color: #303f9f;
    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;
    }
  }

This code is to have an animated download button

Animated Download Button

SASS