.btn {
  border-radius: 4px;
  border: 2px solid rgb(83, 83, 83);
  color: rgb(83, 83, 83);
  display: inline-block;
  margin: 0 .5em;
  overflow: hidden;
  padding: 14px 60px 14px 6px;
  position: relative;
  text-decoration: none;
  line-height: 1;
}

.btn .btn-content {
  font-size: 1em;
  line-height: 1.2;
  padding: 0 16px;
  position: relative;
  right: 0;
  transition: right 300ms ease;
  display: block;
  text-align: left;
}

.btn .icon {
  border-left: 1px solid rgb(83, 83, 83);
  position: absolute;
  right: 0;
  text-align: center;
  top: 50%;
  transition: all 300ms ease;
  transform: translateY(-50%);
  width: 58px;
  height: 70%;
}

.btn .icon i {
  position: relative;
  top: 50%;
  transform: translateY(-50%);
}

.btn:after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  right: 0;
  left: 0;
  background-color: rgb(83, 83, 83);
  opacity: 0;
  transition: opacity 300ms ease;
}

.btn:hover .btn-content {
  right: 100%;
}

.btn:hover .icon {
  border-left: 0;
  font-size: 1.8em;
  width: 100%;
}

.btn:hover:after {
  opacity: .2;
}

.btn.btn-alt-color {
  border-color: rgb(170, 21, 39);
  color: rgb(170, 21, 39);
}

.btn.btn-alt-color .icon {
  border-left-color: rgb(170, 21, 39);
}

.btn.btn-alt-color:after {
  background-color: rgb(170, 21, 39);
}