body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f4f6f9;
}

header {
    background: #1e3c72;
    color: white;
    padding: 20px;
    text-align: center;
}

nav {
    background: #fff;
    padding: 10px;
    text-align: center;
}

nav button {
    margin: 5px;
    padding: 10px 20px;
    border: none;
    background: #1e3c72;
    color: white;
    cursor: pointer;
    border-radius: 5px;
}

nav button:hover {
    background: #16305a;
}

.content {
    padding: 20px;
}

textarea {
    width: 100%;
    height: 120px;
    margin-top: 10px;
}

.hidden {
    display: none;
}

footer {
    text-align: center;
    background: #ddd;
    padding: 10px;
}