Product Pages drop down menus are huge, how can I resize these?

On my product pages, the drop down menus and huge, how can I resize these to reflect the font size in the description?

https://tonyareneebray.com/your-dharma-adventure-curated-goods/p/crescent-moon-necklace-in-sterling-silver-by-michelle-chang

You can try this to Website > Website Tools > Custom CSS

.product-details .variant-option select, .product-details .variant-option select *, .product-details .variant-select-wrapper:before {
    font-size: 15px !important;
}