<style>
    .flash-message {
        padding: 10px;
        margin: 10px auto;
        max-width: 800px;
        border-radius: 5px;
        text-align: center;
    }

    .flash-success {
        background-color: #d4edda;
        color: #155724;
        border: 1px solid #c3e6cb;
    }

    .flash-danger {
        background-color: #f8d7da;
        color: #721c24;
        border: 1px solid #f5c6cb;
    }

    .flash-warning {
        background-color: #fff3cd;
        color: #856404;
        border: 1px solid #ffeeba;
    }
</style>