#custom-size-fields {
    margin-top: 20px;
    background: #f9f9f9;
    padding: 15px;
    border: 1px solid #ddd;
    border-radius: 5px;
}
#custom-size-fields label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
}
#custom-size-fields input {
    width: 100%;
    padding: 5px;
    margin-bottom: 15px;
}
#custom_price_output {
    font-weight: bold;
    color: #007cba;
    display: none;
}