.other-way a {
    margin: 0 13px;
    width: 40px;
    height: 40px;
    text-indent: -100px;
    display: inline-block;
    vertical-align: top;
    -webkit-border-radius: 20px;
    border-radius: 20px;
    background: url(authchoice.png)no-repeat 0 0;
    -webkit-background-size: 250px 40px;
    background-size: 164px 40px;
}
.other-way .qq {background-position: 0 0;}
.other-way .weixin {background-position: -41px 0;}
.other-way .weibo {background-position: -82px 0;}
.other-way .github {background-position: -123px 0;}