html,
body {
    min-height: 100%;
}

body {
    min-height: 100vh;
    box-sizing: border-box;
    margin: 0;
    padding: 3rem 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    text-align: center;
}