<div class="btn" data-title="Wibble">Wibble</div>

body,
html{
  height: 100%;
  text-align: center;
  font-size: 40px;
  font-family: Ubuntu, sans-serif;
}
body:before,
.btn {
  display: inline-block;
  vertical-align: middle;
}
body:before {
  height: 100%;
  content: '';
}
.btn,
.btn:before,
.btn:after {
  cursor: pointer;
  padding: 0.5em 2em;
  display: inline-block;
  background-color: rgba(127, 157, 181, 0.6);
  color: #fff;
  border-radius: 6px;
  position: relative;
  -webkit-transition: all 0.5s cubic-bezier(0.5, 0, 0.5, 1);
  transition: all 0.5s cubic-bezier(0.5, 0, 0.5, 1);
  box-shadow: 0 0 0 rgba(0,0,0,0);
}

.btn:before,
.btn:after {
  position: absolute;
  content: attr(data-title);
  z-index: -1;
}

.btn:before {
  top: -0.1em;
  right: -0.1em;
  background-color: rgba(255, 0, 0, 0.5);
}

.btn:after {
  bottom: -0.1em;
  left: -0.1em;
  background-color: rgba(0, 0, 255, 0.5);
}

.btn:hover {
  background-color: rgba(127, 157, 181, 1);
  box-shadow: 0.05em 0.05em 0.1em rgba(0,0,0,0.5); 
}

.btn:hover:before {
  top: 0;
  right: 0;
}
.btn:hover:after {
  bottom: 0;
  left: 0;
}