/* Body styling */
body {
    max-width: 640px;
    margin: 8px auto;
    padding: 0 8px;
    box-sizing: border-box;

    line-height: 1.5;
}

/* Heading styling */
h1, h2, h3, h4, h5, h6 {
    line-height: initial;
}

/* Details styling */
summary {
    font-weight: bold;
}