.git-link {
    z-index: 100;
    position: absolute;
    top: 0;
    right: 0;
    border: 0;
    height: 120px;
    width: 149px;
    transform: rotate(90deg);
    -webkit-transform: rotate(90deg);
    -moz-transform: rotate(90deg);
    -o-transform: rotate(90deg);
    -ms-transform: rotate(90deg);
    background-image: url(//www.cnblogs.com/images/cnblogs_com/jiamingZ/1440206/t_1.png);
}