Module:Documentation/sandbox/styles.css

 /* {{PP-template}} */
 .ts-doc-sandbox.mbox-image{
 padding:.75em0.75em.75em;
 }

 .ts-doc-doc{
 clear:both;
 background-color:#ecfcf4;
 border:1pxsolid#a2a9b1;
 margin-top:1em;
 padding:5px;
 }

 .ts-doc-header{
 padding-bottom:3px;
 border-bottom:1pxsolid#a2a9b1;
 margin-bottom:1ex;
 }

 .ts-doc-header.ts-tlinks-tlinks{
 display:inline-block;
 line-height:24px;
 margin-left:1em;
 }

 .ts-doc-header.ts-tlinks-tlinksa.external{
 color:#0645ad;
 }

 .ts-doc-header.ts-tlinks-tlinksa.external:visited{
 color:#0b0080;
 }

 .ts-doc-header.ts-tlinks-tlinksa.external:active{
 color:#faa700;
 }

 .ts-doc-content:after{
 content:'';
 clear:both;
 display:block;
 }

 .ts-doc-heading{
 display:inline-block;
 padding-left:55px;
 background:centerleft/50pxno-repeat;
 background-image:url(https://upload.wikimedia.org/wikipedia/commons/thumb/4/43/Test_Template_Info-Icon_-_Version_%282%29.svg/50px-Test_Template_Info-Icon_-_Version_%282%29.svg.png);
 background-image:url(https://upload.wikimedia.org/wikipedia/commons/4/43/Test_Template_Info-Icon_-_Version_%282%29.svg);
 font-size:1.5em;
 }

 .ts-doc-content>*:first-child,
 .ts-doc-footer>*:first-child{
 margin-top:.5em;
 }

 .ts-doc-content>*:last-child,
 .ts-doc-footer>*:last-child{
 margin-bottom:.5em;
 }

 .ts-doc-footer{
 background-color:#ecfcf4;
 border:1pxsolid#a2a9b1;
 padding:.25em1em;
 margin-top:.2em;
 font-style:italic;
 }

 .ts-doc-footersmall{
 font-style:normal;
 }

 .ts-doc-sandbox{
 clear:both;
 }

 @mediascreen{
 html.skin-theme-clientpref-night.ts-doc-footer,
 html.skin-theme-clientpref-night.ts-doc-doc{
 background-color:#0b1e1c;
 }
 }
 @mediascreenand(prefers-color-scheme:dark){
 html.skin-theme-clientpref-os.ts-doc-footer,
 html.skin-theme-clientpref-os.ts-doc-doc{
 background-color:#0b1e1c;
 }
 }
 /* fix headers in dark mode */
 .ts-doc-content.mw-headline{
 color:inherit;
 }
 .mw-templatedata-caption,
 .mw-templatedata-format{
 color:inherit;
 }
 /* fix icon for templatedata params (inline/block) in dark mode */
 .mw-templatedata-doc-params.oo-ui-widget{
 filter:unset!important;
 }