body {
    background: #00cc99;
    font-family: Arial;
    margin: 0;
    padding: 0;
}

.alert {
    display: none;
    background-color: #f9f9f9;
    border: 2px solid #ccc;
    border-radius: 5px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    margin: 20px;
    padding: 20px;
}

.alert h3 {
    margin-top: 0;
}