html,body,head,div,p,a{margin: 0;padding: 0;}
body { overflow: hidden;}
.body-bg{background-color: #fff;}
.main{
    width: 100%;
    height: 700px;
    background: url(images/404bg.png) no-repeat center;
    position: absolute; 
    bottom: 0;
}
.button {
    position: absolute;
    bottom: 360px;
    text-decoration: none;
    right: 50%;
    display: block;
    width: 160px;
    height: 50px;
    border-radius: 3px;
    background-color: #0091e4;
    color: #fff;
    text-align: center;
    font-size: 20px;
    line-height: 2.5;
}