Template:Infobox/sandbox/styles.css

/* https://github.com/botoxparty/XP.css/blob/155b9efdeeb06ff7bbdf1e8e9796e28315739393/themes/XP/_window.scss#L5-L35 */
.pbwiki-window {
	background: #f2efde;
    box-shadow: inset -1px -1px #00138c, inset 1px 1px #0831d9, inset -2px -2px #001ea0, inset 2px 2px #166aee,
        inset -3px -3px #003bda, inset 3px 3px #0855dd;
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
    padding: 0 0 3px 0;
}

.pbwiki-titlebar {
	font-family: "Trebuchet MS", Tahoma, sans-serif;
    background: linear-gradient(
        180deg,
        rgba(9, 151, 255, 1) 0%,
        rgba(0, 83, 238, 1) 8%,
        rgba(0, 80, 238, 1) 40%,
        rgba(0, 102, 255, 1) 88%,
        rgba(0, 102, 255, 1) 93%,
        rgba(0, 91, 255, 1) 95%,
        rgba(0, 61, 215, 1) 96%,
        rgba(0, 61, 215, 1) 100%
    );
    padding: 3px 5px 3px 3px;
    border-top: 1px solid #0831d9;
    border-left: 1px solid #0831d9;
    border-right: 1px solid #001ea0;
    border-top-left-radius: 8px;
    border-top-right-radius: 7px;
    font-size: 13px;
    text-shadow: 1px 1px #0f1089;
    height: 21px;
}