dialog{position:absolute;left:0;right:0;margin:auto;border:solid;padding:1em;background:#fff;color:#000;width:-moz-fit-content;width:-webkit-fit-content;width:fit-content;height:-moz-fit-content;height:-webkit-fit-content;height:fit-content;display:none}dialog[open]{display:block}.backdrop{position:fixed;background-color:rgba(0,0,0,.1);top:0;bottom:0;left:0;right:0}