.btn {
    position: relative;
    overflow: hidden;
    border-width: 0;
    outline: none;
    border-radius: 2px;
    box-shadow: 0 1px 4px rgba(0, 0, 0, 0.6);
    transition: background-color 0.3s;
}

.btn:hover,
.btn:focus {
  background-color: #27ae60;
}

.btn > * {
  position: relative;
}


.btn:before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  display: block;
  width: 0;
  padding-top: 0;
  border-radius: 100%;
  background-color: rgba(236, 240, 241, 0.3);
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
  -ms-transform: translate(-50%, -50%);
  -o-transform: translate(-50%, -50%);
  transform: translate(-50%, -50%);
}

.btn:active:before {
  width: 120%;
  padding-top: 120%;

  transition: width 0.2s ease-out, padding-top 0.2s ease-out;
}

.btn.orange {
  background-color: #e67e22;
}

.btn.orange:hover,
.btn.orange:focus {
  background-color: #d35400;
}

.btn.red {
  background-color: #e74c3c;
}

.btn.red:hover,
.btn.red:focus {
  background-color: #c0392b;
}