Leonardo Montenegro
I recommend this online #CSS3 code generator by @enjoycss
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{"sid":"ES","rid":0,"page":"code","page_params":[],"username":""}
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We'll add only required prefixes
for browsers you gonna choose,
based on data from caniuse.com
4+
4+
9+
10.5+
4+
5.0+
2.1+
7+
Hide default rules
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HTML
<div class="button">facebook</div>
<link async href="http://fonts.googleapis.com/css?family=Open%20Sans" data-generated="http://enjoycss.com" rel="stylesheet" type="text/css"/>
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CSS
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SCSS
.button {
  display: inline-block;
  -webkit-box-sizing: content-box;
  -moz-box-sizing: content-box;
  box-sizing: content-box;
  position: relative;
  cursor: pointer;
  padding: 0 20px 0 73px;
  border: none;
  font: normal 20px/2.4 "Open Sans", Helvetica, sans-serif;
  color: rgba(255,255,255,0.9);
  text-transform: capitalize;
  -o-text-overflow: clip;
  text-overflow: clip;
  background: rgba(100,138,214,1);
  -webkit-box-shadow: 0 5px 0 0 rgba(88,116,173,1) ;
  box-shadow: 0 5px 0 0 rgba(88,116,173,1) ;
  text-shadow: 0 1px 1px rgba(87,151,180,0.36) ;
  -webkit-transition: top 50ms cubic-bezier(0.42, 0, 0.58, 1);
  -moz-transition: top 50ms cubic-bezier(0.42, 0, 0.58, 1);
  -o-transition: top 50ms cubic-bezier(0.42, 0, 0.58, 1);
  transition: top 50ms cubic-bezier(0.42, 0, 0.58, 1);
}

.button:hover {
  background: rgba(91,125,193,1);
  -webkit-box-shadow: 0 5px 0 0 rgba(80,105,155,1) ;
  box-shadow: 0 5px 0 0 rgba(80,105,155,1) ;
  -webkit-transition: none;
  -moz-transition: none;
  -o-transition: none;
  transition: none;
}

.button:active {
  top: 2px;
  -webkit-box-shadow: 0 3px 0 0 rgba(80,105,155,1) ;
  box-shadow: 0 3px 0 0 rgba(80,105,155,1) ;
}

.button::before {
  display: inline-block;
  -webkit-box-sizing: content-box;
  -moz-box-sizing: content-box;
  box-sizing: content-box;
  width: 50px;
  height: 100%;
  position: absolute;
  content: "";
  cursor: pointer;
  top: 0;
  left: 0;
  border: 0 solid #018dc4;
  border-right: 1px solid rgba(255,255,255,0.2);
  font: normal medium/normal Arial, Helvetica, sans-serif;
  color: rgba(0,0,0,0.9);
  -o-text-overflow: clip;
  text-overflow: clip;
  background: url("https://enjoycss.com/bg-img/custom/21875-v2clm0.png"), rgba(0,0,0,0.05);
  background-repeat: no-repeat;
  background-position: 50% 50%;
  -webkit-background-origin: content-box;
  background-origin: content-box;
  -webkit-background-clip: border-box;
  background-clip: border-box;
  -webkit-background-size: 30px auto;
  background-size: 30px auto;
  text-shadow: -1px -1px 0 rgba(15,73,168,0.66) ;
  -webkit-transition: all 300ms cubic-bezier(0.42, 0, 0.58, 1);
  -moz-transition: all 300ms cubic-bezier(0.42, 0, 0.58, 1);
  -o-transition: all 300ms cubic-bezier(0.42, 0, 0.58, 1);
  transition: all 300ms cubic-bezier(0.42, 0, 0.58, 1);
}