.content {
    position: absolute;
    width: 100%;
    height: calc(100vh);
}
.content img {
    width: 100%;
    height: calc(100vh);
}
.index-img {
    position: absolute;
    z-index: 999;
    display: block;
    float: left;
}
.index-img img {
    width: 381px;
    height: 65px;
    margin: 45px;
}
.top-right-span {
    position: absolute;
    top: 45px;
    right: 45px;
    color: white;
    font-size: 26px;
}
a,a:active,a:hover {
    color: white;
}