form { margin: 20px auto; }

label { display: block; margin-top: 10px; }

input[type=text], input[type=email] { padding: 4px; box-sizing: border-box;}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: #1976d2;
    box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.4);
}

button { margin-top: 15px; padding: 5px 10px; }

.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
}

.modal-content {
    background-color: #fff;
    margin: 15% auto;
    padding: 20px;
    width: 400px;
    border-radius: 5px;
    text-align: center;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}