dialog{background:#fff;border:solid;color:#000;display:block;height:-moz-fit-content;height:-webkit-fit-content;height:fit-content;left:0;margin:auto;padding:1em;position:absolute;right:0;width:-moz-fit-content;width:-webkit-fit-content;width:fit-content}dialog:not([open]){display:none}dialog+.backdrop{background:rgba(0,0,0,.1)}._dialog_overlay,dialog+.backdrop{bottom:0;left:0;position:fixed;right:0;top:0}dialog.fixed{position:fixed;top:50%;-webkit-transform:translateY(-50%);transform:translateY(-50%)}