body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
}

footer {
    width: 100%;
    height: 70px; 
    background-color: #333;
    color: #fff;
}

.wrapper {
    flex: 1;
    display: flex;
    flex-direction: column;
}