.custom-3d-form {
    max-width: 600px;
    margin: 20px auto;
    padding: 20px;
    border: 1px solid #ccc;
    border-radius: 5px;
}
.custom-3d-form label {
    display: block;
    margin: 10px 0 5px;
}
.custom-3d-form input, .custom-3d-form select {
    width: 100%;
    padding: 8px;
    margin-bottom: 10px;
}
.stl-results {
    margin-top: 20px;
    padding: 10px;
    background: #f9f9f9;
    border-radius: 5px;
}
.error {
    color: red;
}