.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background-color: #FFFFFF;
    z-index: 10000;
    box-shadow: 0 2px 5px rgba(61,61,61,0.35);
}
.header a{
    display: inline-block;
    height: 100px;
    line-height: 100px;
    margin-left: 50px;
}
.header .current{
    float: right;
    line-height: 0;
    margin-right: 20px;
}