.btn-4 {
  position: relative;
  display: inline-block;
  vertical-align: middle;
  -webkit-appearance: none;
  border: none;
  outline: none !important;
  color: #ffffff;
  text-transform: capitalize;
  transition: all 0.3s linear;
  z-index: 1;
  overflow: hidden;
  padding: 0 30px;
  line-height: 50px;
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.5px;
  font-family: 'Roboto', sans-serif;
  overflow: hidden;
  border-radius: 3px;
  cursor: pointer;
}

.btn-4 i::before {
  position: relative;
  font-size: 18px;
  top: 3px;
  padding-left: 5px;
}

.btn-4:hover {
  color: #fff;
}

.btn-4:hover:after {
  transform: perspective(200px) scaleX(1.05) rotateX(0deg) translateZ(0);
  transition: transform 0.4s linear, transform 0.4s linear;
}

.btn-4:after {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  content: "";
  border-radius: 3px;
  transform: perspective(200px) scaleX(0.1) rotateX(90deg) translateZ(-10px);
  transform-origin: bottom center;
  transition: transform 0.4s linear, transform 0.4s linear;
  z-index: -1;
}