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

#container {
    height: 500px;
    min-width: 310px;
    max-width: 800px;
    margin: 0 auto;
}

.buttons {
    text-align: center;
}

.buttons button {
    border: none;
    background: none;
    font-weight: bold;
    color: silver;
    font-size: 1.2rem;
}

.buttons button.active {
    color: black;
}
