* {
    padding: 0;
    margin: 0;
}
html,body{
    height: 100%;
}
.box {
    background: url(404.png) no-repeat 0 0 / 100% 100%;
    width: 100%;
    height: 100%;
}
.go_home {
    position: absolute;
    bottom:15%;
    width: 2rem;
    height: .5rem;
    font-size: .2rem;
    background-color: #3b65b4;
    color:#fff;
    font-weight: 600;
    left: 50%;
    border-radius: .1rem;
    transform:translateX(-60%);
    text-align: center;
    line-height: .5rem;
    cursor:pointer;
}