.product-addons {
    margin: 20px 0;
    padding: 15px;
    border: 1px solid #ddd;
    background: #f9f9f9;
}

.addon-field {
    margin-bottom: 10px;
}

.addon-field label {
    font-weight: bold;
    display: block;
    margin-bottom: 5px;
    font-size: 16px;
}
.addon-field input[type="checkbox"] {
    margin-right: 5px;
}
.product-addons h3 {
    font-size: 22px;
    margin-bottom: 10px;
}
.addon-field select {
    width: 100%;
    max-width: 200px;
}

.radio-group {
    margin-top: 5px;
}

.addons-total-price {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #ddd;
    font-size: 1.2em;
}