* {
    font-family:
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        Roboto,
        Helvetica,
        Arial,
        "Apple Color Emoji",
        "Segoe UI Emoji",
        "Segoe UI Symbol",
        sans-serif;
}

h1 {
    font-size: 1.5em;
    margin: 10px;
    text-align: center;
}

#outer {
    max-width: 420px;
    margin: 1em auto;
}

.container {
    width: 200px;
    height: 200px;
    display: inline-block;
}
