#content{
    display: grid;
    height:calc(100vh - 50px - 100px) ;
    position: relative;
    overflow: hidden;
}
#content:before{
    content: ' ';
    display: block;
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background:
        url("../images/paimon/paimon01.png") no-repeat right top
        ,url("../images/paimon/paimon02.png") no-repeat left top;
    opacity: 0.1;
}