body{
    margin:0;
    padding:0;
    background: url("../images/index.jpg") no-repeat center top;
    background-size: cover;
}
html,body{
    height: 100%;
    width: 100%;
}
img{
    border: 0;
}
.index{
    position: relative;
    z-index: 10;
    height: 100%;
}
.index .img{
    margin: auto;
    display: block;
    height: 100%;
    width: auto;
}
.index .xz{
    width: auto;
    position: absolute;
    top: 69.5%;
    margin: auto;
    z-index: 100;
    height: 7.5%;
}
.index .xz img{
    height: 100%;
    width: auto;
    display: block;
}