body {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.container {
    /* flex: 1 1 auto; */
    /*grow vertically*/
    flex-grow: 1;
}

footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1rem 0;
    font-size: 1rem;
}

h1 {
    margin-bottom: 5rem;
}

.clarification {
    font-size: 1.2rem;
    color: #999;
    margin-top: 0.5rem;
}