* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
    header {
        position: fixed;
        top: 0;
        width: 100%;
        background: white;
        color: white;
        padding: 15px;
        text-align: center;
        font-size: 18px;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }

    .logout-btn {
        background: red;
        border: none;
        color: white;
        padding: 8px 12px;
        cursor: pointer;
        border-radius: 5px;
        font-size: 14px;
    }

    .container {
        text-align: center;
        background: white;
        padding: 20px;
        border-radius: 10px;
        box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        margin-top: 80px;
        width: 90%;
        max-width: 400px;
    }

    a {
        display: block;
        text-decoration: none;
        background: blue;
        color: white;
        padding: 10px;
        border-radius: 5px;
        font-size: 16px;
        margin-top: 10px;
    }

    a:hover {
        background: darkblue;
    }

    .hidden {
        width: auto;
        background: #f4f4f4;
        color: white;
    }