html, body {
    min-height: 100vh;
    margin: 0;
}

body {
    display: flex;
    flex-direction: column;
}

main {
    flex: 1;
}

.footer {
    background-color: var(--blue);
    color: white;
    padding: 15px;
    text-align: center;
    margin-top: 20px;
}