body{
	padding: 0;
	margin: 0;
	background: #1E1E22;
}
.container{
	position: absolute;
	top: 50%;
	left: 50%;
	transform: translate(-50%, -50%);
	display: flex;
}
.btn{
	height: 50px;
	width: 50px;
	margin: 20px;
	border-radius: 50%;
	cursor: pointer;
}
.btn1{
	background: #fac536;
	position: relative;
	overflow: hidden;
}
.btn1::before{
	content: '';
	position: absolute;
	top: 100%;
	left: 50%;
	transform: translate(-50%, -50%);
	width: 50%;
	height: 10%;
	opacity: 0;
	background: #222;
	transition: 300ms;
}
.btn1:hover::before{
	opacity: 1;
	top: 50%;
}
.btn2{
	background: #39ea49;
	position: relative;
	overflow: hidden;
}
.btn2::before{
	content: '';
	position: absolute;
	top: 100%;
	left: 50%;
	transform: translate(-50%, -50%);
	width: 45%;
	height: 45%;
	opacity: 0;
	background: #222;
	transition: 300ms;
}
.btn2::after{
	content: '';
	position: absolute;
	top: 100%;
	left: 50%;
	transform: translate(-50%, -50%) rotate(-45deg);
	width: 15%;
	height: 80%;
	opacity: 0;
	background: #39ea49;
	transition: 300ms;
}
.btn2:hover::before, .btn2:hover::after{
	opacity: 1;
	top: 50%;
}
.btn3{
	background: #f25056;
	position: relative;
	overflow: hidden;
}
.btn3::before{
	content: '';
	position: absolute;
	top: 100%;
	left: 50%;
	transform: translate(-50%, -50%) rotate(-45deg);
	width: 15%;
	height: 50%;
	opacity: 0;
	background: #222;
	transition: 300ms;
}
.btn3::after{
	content: '';
	position: absolute;
	top: 100%;
	left: 50%;
	transform: translate(-50%, -50%) rotate(45deg);
	width: 15%;
	opacity: 0;
	height: 50%;
	background: #222;
	transition: 300ms;
}
.btn3:hover::before, .btn3:hover::after{
	opacity: 1;
	top: 50%;
}
a{
  text-decoration: none;
  position: absolute;
  right: 20px;
  bottom: 20px;
  color: #fff;
  font-family: sans-serif;
  font-size: .9rem;
}
a:hover{
  opacity: .8;
  border-bottom: 1px solid rgba(255, 255, 255, .8);
}