.yxtzmask {
    position: absolute;
    width: 100%;
    height: 88%;
    left: 0;
    top: 0;
    background-color: rgba(0,0,0,0.6);}
.yxtzmask {
    position: absolute;
    width: 100%;
    height: 88%;
    left: 0;
    top: 0;
    background-color: rgba(0,0,0,0.6);}