img,iframe{max-width:100%;height:auto} html,body{-webkit-text-size-adjust:100%;text-size-adjust:100%} img{max-width:100%;max-height:calc(85vh - 3em);margin:auto;display:block;} h1,h2,.toy h3{text-align:center;margin:0.5em;} .toy{font-size:200%;} .toy h2{background-color:#36f;width:80%;margin:1em auto;padding:0.5em;color:#fff;border:4px solid #03c;cursor:pointer;} .toy h2:focus,.toy h2:hover{background-color:#69f;border:4px solid #36f;} .toy h2.right,.toy h2.right:focus,.toy h2.right:hover{background-color:#3f6;border:4px solid #0c3;} .toy h2.wrong,.toy h2.focus,.toy h2.wrong:hover{background-color:#f63;border:4px solid #c30;}