main,footer{position:relative}main{z-index:2}.playing #main{z-index:5}footer{z-index:1}.karuta{position:relative;width:100%;aspect-ratio:16/9;background:url(../img/bg_index.png) 0 50%/cover no-repeat}@media screen and (max-width: 767.9px){.karuta{max-width:none;height:56.25%}}[data-isGameEnd=true] .karuta{background-image:url(../img/missionclear.png)}#app[data-isGameStart=true]{position:fixed;left:0;top:0;z-index:2001;background:url(../img/bg.png) 50% 0/contain no-repeat rgba(0,0,0,.8)}#app[data-isGameEnd=true]{background-image:url(../img/bg_header_short.png)}