.size24 {
    width: 24px;
    height: 24px;
}

html, body {
    height: 100%;
    margin: 0;
}

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

main {
    flex: 1; /* isi konten */
}

footer {
    margin-top: auto; /* dorong footer ke bawah */
}