body {
    text-align: center;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    margin: 0 10px;
    font-family: sans-serif;
}
body::before,
body::after {
    content: "";
    pointer-events: none;
    flex-grow: 3;
}
body::before {
    flex-grow: 2;
    max-height: 25vw;
}