JSFiddle - React, Tailwind, and code Playground

by Qwerty_Wasd

HTML

<div class="content-white">        
    <div class="early_access_header_w"> 
       <div class="back_div"><a class="back_menu" href="game.html">Назад</a>
     </div>
</div>

CSS

body {
	margin: 0;
	background: url(images/fon.jpg) no-repeat fixed;
	background-size: cover;
	font: normal 14px SegoePrint;
	line-height: 18px;
	color: #4530af;
}

.early_access_header_w {
	background: white;
	width: 720px;
	padding: 20px 20px 20px;
}

.content-white {
	background: white;
	width: 760px;
	margin: 0 auto;
	padding: 20px 40px 20px;
	text-align: justify;
	top: 50%;
	overflow: auto;
}

.back_div {
	margin: 30px auto;
	padding: 0;
	text-align: center;
	display: block;
}

.back_menu {
	color: green;
	border: 2px solid green;
	text-decoration: none;
	display: inline-block;
	font-size: 18px;
	width: 130px;
	height: 40px;
	line-height: 40px;
	margin: 20px;
	position: relative;
	overflow: hidden;
	transition: color .5s;
	-webkit-box-shadow: 0 0 4px #999;
	-moz-box-shadow: 0 0 4px #999;
	-o-box-shadow: 0 0 4px #999;
	box-shadow: 0 0 4px #999;
	z-index: 0;
}

.back_menu:before {
	background: green;
	content: "";
	position: absolute;
	z-index: -1;
	height: 150px;
	width: 200px;
	-webkit-border-radius: 50%;
	-moz-border-radius: 50%;
	-o-border-radius: 50%;
	border-radius: 50%;
}

.back_menu:hover {
	color: #ffffff;
}

.back_menu:before {
	top: 100%;
	left: 100%;
	transition: all .7s;
}

.back_menu:hover:before {
	top: -30px;
	left: -30px;
}