html {
    background-color: #a9a9a9;
}

.title {
    background-color: #800000;
    font-weight: bold;
    color: #fff;
    /* will be used in media query */
    padding: 16px 8px 2px;
    font-size: 1.5rem;
}

section {
    background-color: #f0f8ff;
    border: 1px solid #000;
    margin: 8px 0 8px;
}

.content {
    padding: 0 8px 0;
}

nav {
    display: flex;
    justify-content: space-around;
}

nav button {
    width: 25%;
    height: 2rem;
}

@media screen and (max-width: 240px) {
    html {
        margin: 0;
        font-size: 11px;
    }
    body {
        margin: 2px;
    }
    nav button {
        border: 1px solid #000;
        font-size: 11px;
        padding: 0;
    }
}