How can I remove the dropdown arrow on a single variant?

I know this question has been asked a LOT, but I’ve tried other suggested solutions, and the best I found was the following code added at the end of the Assets > theme.css:

.product_form, .selector-wrapper, select {
pointer-events: none;
background-image: none;
}

which kept the single variant (size: O/S) displayed which I want, and it also made the dropdown un-clickable, again something I want. However, it still shows the dropdown arrow which I want to remove. (See attached photo).

Second question, should the correct fix work on all different Shopify stores (Shopify Plus, Basic, etc.) and all different Shopify themes?

Thanks for any help!

Hi @DayGlow ,

Could you please share URL and your store password if it enabled? So that we can help you.
Thank you.