SOURCE

<link href="https://cdn.bootcss.com/font-awesome/4.7.0/css/font-awesome.min.css" rel="stylesheet">
<section>
    <div class="button">
      <a href="javascript:void(0)"><i class="fa fa-weibo" aria-hidden="true"></i>关注 @CC君</a>
    </div>
    <div class="cover">
      <div class="innie"></div>
      <div class="spine"></div>
      <div class="outie"></div>
    </div>
    <div class="shadow"></div>
  </section>

section, section div {
  transition-duration: .6s;
}
body {
  background-image: radial-gradient(circle farthest-corner at center top, #FFFFFF 0%, #D8DFE9 100%);
  overflow: hidden;
}
section, .button { 
  transition-timing-function: ease; 
}
section {
  position: relative;
  display: inline-block;
  height: 2.5rem;
  padding: .375rem .375rem 0;
  background: #A9ADB6;
  border-radius: .25rem;
  perspective: 300;
  box-shadow: 0 -1px 2px #fff, inset 0 1px 2px rgba(0,0,0,.2), inset 0 .25rem 1rem rgba(0,0,0,.1);
}
.button { 
  opacity: 0; 
}
.button a {
  display: inline-block;
  height: 28px;
  line-height: 28px;
  padding: 1px 50px 1px 50px;
  color: #FFF;
  background: #ee2436;
  border-radius: 4px;
  font-family: "Microsoft Yahei", Helvetica, sans-serif;
  font-size: 15px;
  text-decoration: none;
}
.button a .fa {
  margin-right: 5px;
  font-size: 17px;
}
.cover {
  position: absolute;
  top: 0; 
  left: 0;
  right: 0; 
  bottom: 0; 
  color: white;
  font: 1.25em "Helvetica";
  line-height: calc(2.5rem + .375rem);
  text-align: center;
  transform-origin: center bottom;
  transform-style: preserve-3d;
  pointer-events: none;
  z-index: 1;
}
.innie, .outie, .spine, .shadow { 
  position: absolute; 
  width: 100%; 
}
.innie, .outie {
  height: 100%;
  background-image: linear-gradient(to bottom, transparent 0%, rgba(0,0,0,.1) 100%);
  border-radius: .25rem;
}
.innie:after, .outie:after { 
  content: "weibo";
}
.innie {
  background-color: #ff555f;
  text-shadow: 0 -2px 4px rgba(0,0,0,.2);
}
.spine {
  top: .25rem;
  height: .25rem;
  background: #f53746;
  transform: rotateX(90deg);
  transform-origin: center top;
}
.outie {
  background-color: #ff555f;
  transform: translateZ(.25rem);
  text-shadow: 0 2px 4px rgba(0,0,0,.2);
}
.shadow {
  left: 0;
  top: 100%;
  height: 3.5rem;
  transform-origin: center top;
  transform: rotateX(90deg);
  opacity: 0;
  background-image: linear-gradient(to bottom, rgba(0,0,0,.6) 0%, transparent 100%);
  border-radius: .4rem;
}
section:hover { 
  background: #EBEFF2;
}
section:hover .button { 
  opacity: 1; 
}
section:hover .cover, section:hover .innie, section:hover .spine, section:hover .outie, section:hover .shadow { 
  transition-timing-function: cubic-bezier(.2,.7,.1,1.1); 
}
section:hover .cover { 
  transform: rotateX(-120deg);  
}
section:hover .innie { 
  background-color: #ff555f; 
}
section:hover .spine { 
  background-color: #ff555f; 
}
section:hover .outie { 
  background-color: #ec1e31; 
  color: rgba(255,255,255,0); 
}
section:hover .shadow { 
  opacity: 1;
  transform: rotateX(45deg) scale(.95);
}