.header {
        display: flex;
        justify-content: space-between;
        align-items: center;
        padding: 10px;
        background-color: #f2f2f2;
    }

    .logout-btn {
        background-color: #d9534f;
        color: white;
        border: none;
        padding: 5px 10px;
        font-size: 14px;
        border-radius: 4px;
        cursor: pointer;
    }

    .logout-btn:hover {
        background-color: #c9302c;
    }

    body {
        font-family: Arial, sans-serif;
        margin: 2em;
        background: #f5f5f5;
    }

    .card {
        background: white;
        padding: 1em;
        margin-bottom: 1em;
        border-radius: 8px;
        box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
    }

    .card h2 {
        margin-top: 0;
    }

    canvas {
        max-width: 100%;
    }

    #countryChart {
        max-width: 300px !important;
        max-height: 300px !important;
        margin: 0 auto;
        display: block;
    }

    table {
        width: 100%;
        border-collapse: collapse;
        margin-top: 1em;
    }

    table,
    th,
    td {
        border: 1px solid #ccc;
    }

    th,
    td {
        padding: 0.5em;
        text-align: left;
    }

    th {
        background: #eee;
    }

    tbody tr:nth-child(odd) {
        background: #fafafa;
    }

    .flex-container {
        display: flex;
        flex-wrap: wrap;
        gap: 1em;
    }

    .flex-container .card {
        flex: 1;
        min-width: 280px;
    }

    .login-form {
        max-width: 300px;
        margin: 2em auto;
        padding: 1em;
        background: white;
        border-radius: 8px;
        box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        text-align: center;
    }

    .login-form input[type="text"],
    .login-form input[type="password"] {
        width: 90%;
        padding: 12px;
        margin: 10px 0;
        border: 1px solid #ccc;
        border-radius: 6px;
        font-size: 16px;
    }

    .login-form input[type="submit"] {
        width: 100%;
        padding: 12px;
        background-color: #4CAF50;
        color: white;
        border: none;
        font-size: 16px;
        border-radius: 6px;
        cursor: pointer;
    }

    .login-form input[type="submit"]:hover {
        background-color: #45a049;
    }