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

#container1,
#container2,
#container3 {
    min-width: 300px;
    max-width: 800px;
    height: 120px;
    margin: 0 auto;
}
