.box{aspect-ratio:400/250;max-width:400px;max-height:250px;width:62.5vw;background-image:url(https://fakeimg.pl/400x250/);background-size:contain}.menu{aspect-ratio:100/100;max-width:100px;max-height:100px;width:15.625vw;background-image:url(https://fakeimg.pl/100x100/ff00ff);background-size:contain;top:10vw;right:10vw}.app{container-type:inline-size;container-name:app}@container app (min-width: 630px){.menu{top:10px;right:10px}}.parent .child{display:flex;justify-content:center;align-items:center;width:100px;height:100px;font-size:40px;color:#000;border:2px solid black}.parent-1.parent .child{color:red}.parent-2.parent .child{color:green}[data-active=true].parent .child{color:#00f}[data-value=true].parent .child{color:pink}.parent .child .parent.ext3.parent .child{color:#abc}