.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
}

.modal-content {
    background-color: #fff;
    width: 80%;
    max-width: 400px;
    margin: 100px auto;
    padding: 20px;
    text-align: center;
}