/* Enable percentage-based height for child elements */
html {
    height: 100%;
}

body {
    min-height: 100%;

    display: flex;
    flex-direction: column;
}

main {
    flex: 1; /* Occupies all remaining space */
    flex-shrink: 0;
}

.container {
    box-sizing: content-box; /* content width = 1200px */
    max-width: 1200px;
    padding: 0 16px;
    margin: 0 auto; /* When a flex item has 'margin: 0 auto', it shrinks to the width of its content. */
}