.git-link {
    z-index: 100;
    position: fixed;
    top: 0;
    right: 0;
    border: 0;
    height: 149px;
    width: 149px;
    transform: rotate(90deg);
    -webkit-transform: rotate(90deg);
    -moz-transform: rotate(90deg);
    -o-transform: rotate(90deg);
    -ms-transform: rotate(90deg);
    background-image: url(//images2015.cnblogs.com/blog/459873/201603/459873-20160317090540131-1089895320.png);
}
body {
    background-color: #efefef;
    background-image: url(https://images.cnblogs.com/cnblogs_com/dafengdeai/1767128/o_200517081607bg.jpg);
    background-repeat: no-repeat;
    background-attachment: fixed;
    background-position: center 0;
    background-size: cover;
    padding-top: 0px;
}