html, body {
    height: 100%;
    margin: 0;
    padding: 0;
}
body {
    display: flex;
    flex-direction: column;
}
header, footer {
    flex-shrink: 0; /* Prevents header/footer from shrinking */
}
.main-content {
    flex-grow: 1; /* Allows content to take remaining space */
    overflow-y: auto; /* Adds scroll if content overflows */
}