how to add stylish download buttom

<a 
  download="Pod-People-Podcast-Episode-12-Feed-Me-Seymour.mp3"
  href="https://www.dropbox.com/s/txf5933cwxhv1so6/12-final-v5-RADIO-EDIT.m4a?dl=0">
  Download Episode 12
</a>

<div style="text-align: center;">
  <ul class="button2">
    <li><a class="demo" href="http://askwithloud.blogspot.com" target="_blank">Demo Link</a></li>
    <li><a class="download" href="http://askwithloud.blogspot.com" target="_blank">Download Link</a></li>
  </ul>
</div>
<div class="clear"></div>

<a 
  href="https://s3-us-west-2.amazonaws.com/ky22o6s6g8be80bak577b17e34bb93cex3.pdf"
  download="{{ user.name | slugify }}-{{ 'now' | date: "%Y" }}-tax-return.pdf">
  Download your {{ 'now' | date: "%Y" }} Tax Return
</a>

/* CSS Button Style 1 by indzign.blogspot.com */
.button{float:left;list-style:none;text-align:center;width:95%;margin:10px;padding:2px;font-size:14px;clear:both}
.button ul{margin:0;padding:0}
.button li{display:inline;margin:5px;padding:0;list-style:none}
.button li a.demo,.button li a.download{position:relative;padding:9px 48px 9px 16px;background:#f39c12;color:#fff!important;font-weight:700;font-size:14px;text-align:center;text-transform:uppercase;letter-spacing:0.5px;border-radius:3px;box-shadow:0 1px rgba(0,0,0,0.1);line-height:normal;transition:all .3s}
.button li a.download{background:#3498db}
.button li a.demo:hover,.button li a.download:hover{background:#666}
.button li a.demo:active,.button li a.download:active{cursor:pointer}
.button li a.demo:after,.button li a.download:after{content:'\f135';background:rgba(0,0,0,0.1);position:absolute;right:0;top:0;font-weight:normal;display:inline-block;margin:0 0 0 10px;color:#fff;padding:11px;font-family:fontawesome}
.button li a.download:after{content:'\f019'}

/* CSS Button Style 2 by indzign.blogspot.com */
.button2{float:left;list-style:none;text-align:center;width:95%;margin:10px;padding:2px;font-size:14px;clear:both}
.button2 ul{margin:0;padding:0}
.button2 li{display:inline;margin:5px;padding:0;list-style:none}
.button2 li a.demo,.button2 li a.download{position:relative;padding:14px 48px 14px 16px;background:#f39c12;display:block;color:#fff!important;font-weight:700;font-size:14px;text-align:left;text-transform:uppercase;letter-spacing:.2px;border-radius:3px;box-shadow:0 1px rgba(0,0,0,0.1);line-height:normal;transition:all .3s;max-width:170px;margin:auto;overflow:hidden}
.button2 li a.download{background:#3498db}
.button2 li a.demo:hover,.button2 li a.download:hover{background:#666}
.button2 li a.demo:active,.button2 li a.download:active{cursor:pointer}
.button2 li a.demo:after,.button2 li a.download:after{content:'\F054';background:rgba(0,0,0,0.1);position:absolute;right:0;top:0;font-weight:normal;display:inline-block;margin:0 0 0 10px;color:#fff;padding:16px 24px;font-family:fontawesome;transition:all .3s}
.button2 li:hover a.demo:after,.button2 li:hover a.download:after{background:transparent;-webkit-animation:bounceright .3s alternate ease infinite;animation:bounceright .3s alternate ease infinite}
@-webkit-keyframes bounceright{from{-webkit-transform:translateX(0)}to{-webkit-transform:translateX(3px)}}
@keyframes bounceright{from{transform:translateX(0)}to{transform:translateX(3px)}}