body {
    font-family: sans-serif;
    margin: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
    background-color: #f0f2f5;
}

header {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}

nav#navigasi-tugas button {
    background-color: #555;
    color: white;
    border: none;
    padding: 10px 20px;
    margin: 0 5px;
    cursor: pointer;
    border-radius: 5px;
    transition: background-color 0.3s;
}

nav#navigasi-tugas button:hover {
    background-color: #007BFF;
}

main {
    flex-grow: 1; /* Membuat main mengisi sisa ruang */
    padding: 1rem;
}

iframe#frame-tugas {
    width: 100%;
    height: 100%;
    border: 1px solid #ccc;
    border-radius: 8px;
    background-color: white;
}