css3按钮效果

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
        <title>qdabc.cn</title>
        <style>
            div{
	text-align:center;
	
}
a {
    margin:10px 0;
    border: none;
    font-family: 'Lato', sans-serif;
    font-size: 20px;
    line-height: 0px;
    color: #fff;
    cursor: pointer;
    width:308px;
    padding: 25px 58px;
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
    outline: none;
    background-color: rgba(255, 212, 64, 0.9);
    -webkit-transition: all 0.3s;
    -moz-transition: all 0.3s;
    transition: all 0.3s;
    overflow: hidden;
    position:relative;
    z-index: 9999;
}

a:after {
    content:"";
    width: 100%;
    height: 0;
    position:absolute;
    top: 50%;
    left: 50%;
    background: #fff;
    opacity: 0;
    -webkit-transform: translateX(-50%) translateY(-50%) rotate(45deg);
    -moz-transform: translateX(-50%) translateY(-50%) rotate(45deg);
    -ms-transform: translateX(-50%) translateY(-50%) rotate(45deg);
    transform: translateX(-50%) translateY(-50%) rotate(45deg);
    -webkit-transition: all .5s;
    -moz-transition: all .5s;
    transition: all .5s;
    color:#000;
}
a:hover{
    color:#000;
    background-color: rgba(255, 212, 64, 0.9);
}

a:hover:after {
    height: 560%;
    opacity: 1;
    z-index: -1;
}

        </style>
    </head>
    <body>
    <div>
	   <a>登录</a><br />
	   <a>登录</a><br />
	   <a>登录</a><br />
	   <a>登录</a><br />
	   <a>登录</a><br />
    </div>
    </body>
    
</html>

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