body{
	padding: 0;
	margin: 0;
}
.middle{
	position: absolute;
	top 50%;
	/*transform: translateY(-50%);*/
	width: 100%;
	text-align: center;
}
.btn{
	display: inline-block;
	width: 50px;
	height: 50px;
	background: #f1f1f1;
	margin: 10px;
	border-radius: 30%;
	box-shadow: 0 5px 15px -5px #00000070;
	/*color: #3498db;*/
	color: #6B4E01;
	overflow: hidden;
	position: relative;
}
.btn i{
	line-height: 50px;
	font-size: 15px;
	transition: 0.2s linear;
}
.btn:hover i{
	transform: scale(1.3);
	color: #f1f1f1;
}
.btn::before{
	content: "";
	position: absolute;
	width: 100%;
	height: 100%;
	/*background: #3498db;*/
	background: #6B4E01;
	transform: rotate(45deg);
	left: -110%;
	top: 90%;
}
.btn:hover::before{
	animation: aaa 0.7s 1;
	top: -10%;
	left: -10%;
}
@keyframes aaa {
	0%{
		left: -110%;
		top: 90%;
	}50%{
		left: 10%;
		top: -30%;
	}100%{
		top: -10%;
		left: -10%;
	}
}