docgo.css

.center {
  text-align: center;
}
.container {
  height: 100px;
  position: relative;
}

.btn-center {
  margin: 0;
  position: absolute;
  top: 50%;
  left: 50%;
  -ms-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

button {
  display: inline-block;
  background-color: #7b38d8;
  border-radius: 10px;
  border: 4px double #cccccc;
  color: #eeeeee;
  text-align: center;
  font-size: 28px;
  padding: 20px;
  width: 100px;
  transition: all 0.5s;
  cursor: pointer;
  margin: 5px;
}
button span {
  cursor: pointer;
  display: inline-block;
  position: relative;
  transition: 0.5s;
}
button span:after {
  content: "\00bb";
  position: absolute;
  opacity: 0;
  top: 0;
  right: -20px;
  transition: 0.5s;
}
button:hover {
  background-color: #f7c2f9;
}
button:hover span {
  padding-right: 25px;
}
button:hover span:after {
  opacity: 1;
  right: 0;
}