WWDC20 - Safari 14 Web Extension

popup.css

:root {
    color-scheme: light dark;
}

body {
    width: 100px;
    padding: 10px;
    font-family: system-ui;
    text-align: center;
}

span {
    display: block;
    margin: auto;
    margin-top: 5px;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    background-color: #fff;
    box-shadow: 0, 0, 8px rgba(0, 0, 0, .5);
}

span::before {
    content: "🍎";
    line-height: 30px;
}

@media (prefers-color-scheme: dark) {
    span {
        background-color: #000;
    }
}