a.sd_link {
    width: 250px;
    height: 50px;
    line-height: 50px;
    margin: 0 auto;
    display: block;
    margin-bottom: 100px;
    margin-top: 50px;
}

/* a.sd_link:hover {
    background-color: #32beff;
    border: 1px solid #32beff;
    color: #fff
} */