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CSS

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HTML 

              
                <div class="flipper-container">
  <a class="flipper" href="https://eoimages.gsfc.nasa.gov/images/imagerecords/73000/73751/world.topo.bathy.200407.3x21600x10800.jpg" title="25 MB.jpg" onclickk="downloadFile('https://eoimages.gsfc.nasa.gov/images/imagerecords/73000/73751/world.topo.bathy.200407.3x21600x10800.jpg','25MB1.jpg',this);">
    <div id="download" class="front-face" data-icon="&#x25BC;
"><span>Download audio <svg version="1.1" id="Capa_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
	 width="32px" height="32px" viewBox="0 0 960 960" enable-background="new 0 0 960 960" xml:space="preserve">
<g>
	<g>
		<path fill="#FFFFFF" d="M559.175,109.163c-66.309,0-131.232,17.616-188.041,51.068c-50.672,29.889-93.625,71.456-125.097,120.94
			H104.313C46.713,281.171,0,327.885,0,385.484v189.031c0,57.6,46.713,104.313,104.313,104.313h141.724
			c31.472,49.484,74.425,91.052,125.097,120.94c56.809,33.451,121.732,51.067,188.041,51.067c14.846,0,26.722-11.876,26.722-26.722
			v-688.23C585.896,121.237,574.021,109.163,559.175,109.163z M234.359,625.386H104.313c-28.107,0-50.87-22.763-50.87-50.87V385.484
			c0-28.107,22.763-50.87,50.87-50.87h130.045V625.386z M532.453,796.404c-100.354-8.512-191.802-64.924-244.651-151.621V315.415
			c52.849-86.697,144.296-143.109,244.651-151.621V796.404z"/>
		<path fill="#FFFFFF" d="M690.606,273.056c-12.074-8.511-28.701-5.542-37.213,6.73c-8.511,12.074-5.542,28.701,6.73,37.212
			c53.443,37.212,85.312,98.375,85.312,163.299s-31.868,126.087-85.312,163.299c-12.074,8.512-15.044,25.139-6.73,37.213
			c5.146,7.521,13.46,11.48,21.972,11.48c5.344,0,10.688-1.584,15.241-4.751c67.694-47.308,108.272-124.701,108.272-207.043
			C798.879,398.152,758.301,320.165,690.606,273.056z"/>
		<path fill="#FFFFFF" d="M793.93,162.408c-12.074-8.511-28.701-5.542-37.212,6.73c-8.512,12.074-5.542,28.701,6.729,37.212
			c89.666,62.548,143.109,164.882,143.109,273.748c0,108.866-53.443,211.398-143.109,273.749
			c-12.074,8.511-15.043,25.138-6.729,37.212c5.146,7.521,13.46,11.48,21.971,11.48c5.345,0,10.688-1.583,15.241-4.75
			C897.848,725.345,960,606.581,960,480.099S898.045,234.854,793.93,162.408z"/>
	</g>
</g>
</svg></span></div>
  </a>
</div>
!

CSS 

              
                @import "compass/css3";

// Variables
$dark: #282828;
$pink: #fc2161;
$pink-d: darken($pink, 15%);
$green: #77BD42;
$green-d: darken($green, 15%);

// Fonts
@import url(https://fonts.googleapis.com/css?family=Montserrat:400);


// Get to business
body {
  background-color: #24282e;
  /*background-image:url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAgAAAAICAQAAABuBnYAAAAAU0lEQVQIHQXBwRGDIBAAwO2/AMcCDHAcPjIRxjJ8Je1kl1uqUgphsWu6w0sIG6npLpcUBql4e/wsVRKabrkNTacIYbMrwsF06rqUhsnXVKVT+Hj+Ue4rPSONk4kAAAAASUVORK5CYII=);*/
  padding-top: 80px;
  text-align: center;
}

.flipper-container {
  text-align: center;
  margin-top: 40px;
  @include perspective(1000);
}

.flipper {
  display: inline-block;
  position: relative;
  text-decoration: none;
  font-family: 'Montserrat', arial, sans-serif;
  font-weight: 400;
  text-transform: uppercase;
  width: 20em; height: 4.5em;
  background-color: $dark;
  box-shadow: 0 3px 5px $dark;
  cursor: pointer;
}
#download {
  overflow: hidden;
}
.front-face, .back-face {
  position: absolute;
  z-index: 10;
  width: 100%; height: 100%;
  top: 0; left: 0;
  padding-right: 70px;
  letter-spacing: 2px;
  line-height: 4.5em;
  @include border-radius(2px);
  @include backface-visibility(hidden);
  
  &:before {
    content: attr(data-icon);
    font-size: 30px;
    position: absolute;
    z-index: -20;
    top: 0; right: 0;
    height: 100%; width: 70px;
    border-radius: 0 2px 2px 0;
  }
  
  &:after {
    content: '';
    background-color: $green;
    height: 100%;
    width: 0;
    position: absolute;
    z-index: -10;
    left: 0;
  }
}

.front-face {
  background-color: $pink;
  color: #fff;
  text-shadow: 0 1px 1px darken($pink, 20%);
  span svg{
    position: absolute;
    top: 18px;
    right: 90px;
  }
  &:before {
    @include background-image(linear-gradient(45deg,       $pink-d 0%, #eb1f56 50%, #f91858 50%, $pink));
  }
  
}

.back-face {
  background-color: $green;
  color: $green-d; 
  
  &:before {
    @include background-image(linear-gradient(45deg,       $green-d 0%, #76bc42 50%, #7dbd4c 50%, $green));
    content: '\2713';
  }
}
!

JS 

              
                $( ".flipper" ).on( "click", function( event ) {
  event.preventDefault()
  var href = $( this ).attr("href");
  var name = $( this ).attr("title");
  
  downloadFile(href, name);
});

function updateDLProgress(evt) {
    if (evt.lengthComputable) {
        var percentComplete = (evt.loaded / evt.total) * 100;
        if (evt.loaded < evt.total) {
          $('#download span').text("DOWNLOADING... " + Math.round(percentComplete) + "%");
          $('<style>.front-face::after{width:'+Math.round(percentComplete)+'%}</style>').appendTo('body');
        } else {
          $('#download span').text("DOWNLOAD COMPLETE");
          $('#download').attr("class", "back-face");
        }
    } else {
      $('#download span').text("Downloading... " + evt.total + "%"); 
    }
}

function downloadFile(urlToSend, fileName) {
    $('#download span').text("WORKING...");
    var req = new XMLHttpRequest();
    req.open("GET", "https://cors-anywhere.herokuapp.com/" + urlToSend, true);
    //req.open("GET", urlToSend, true);
    req.setRequestHeader("Cache-Control", "no-cache");
    req.onprogress = updateDLProgress;
    req.responseType = "blob";
    req.onload = function(event) {
        var blob = req.response;
        var link = document.createElement('a');
        link.href = window.URL.createObjectURL(blob);
        link.download = fileName;
        document.body.appendChild(link);
        link.click();
        link.remove()
    };
    req.send();
}

// https://jsfiddle.net/0y1ozthj/7/ new work
!
999px

Console