body{
  font-family: montserrat;
}
.center{
  position: absolute;
  top: 10%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 310px;
  padding: 0 50px;
  text-align: center;
  box-sizing: border-box;
  transition: all .3s ease .3s;
}
.center button{
  position: relative;
  width: 100%;
  border: none;
  padding: 5px 0;
  cursor: pointer;
  outline: none;
  border-radius: 50px;
  background: linear-gradient(#ff1a1a, #ff0000, #ff3333);
  transition: .5s;
}
button:hover{
  background: linear-gradient(#ff1a1a, #ff0000, #ff3333);
}
button p{
  color: white;
  font-size: 22px;
  font-weight: 700;
  text-transform: uppercase;
  margin: 15px;
}
button .loading, button .fa{
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}
button .loading{
  width: 0%;
  border-radius: 50px;
  background: linear-gradient(#ff1a1a, #ff0000, #ff3333);
}
button .fa{
  color: white;
  font-size: 35px;
  line-height: 65px;
  transform: scale(0);
}
.center.active{
  padding: 0;
}
.center.active button{
  background: gray;
  margin-top: 0;
}
.center.active button p{
  display: none;
}
.center.active button .loading{
  width: 100%;
  transition: all 2.7s ease .6s;
}
.center.active button.success{
  padding: 35px 0;
  width: 250px;
}
.center.active button.success .fa{
  transform: scale(1);
  transition: transform .2s linear .3s;
}

button:hover {

  transform: scale(0.85);
}