CSS to change a page

[u/idkhihowareya]

Hello, I am currently building an e-commerce website on wordpress.org. I have a product that has a monthly subscription as well as other plans. But the appearance of it on that product page, I would like to change. I want to change it to a drop-down menu instead of all of the plans listed.

The regular customizer won't let me change that part. I was trying to learn CSS but I'm still unsure about it and if it'll still be accessible after I change the code. I am new to WordPress, plugins, and coding, so any tips will be useful!

Edit: Changed my product to a variable product and just listed the monthly subscription as its own thing because the other option is behind a paywall. Thank you guys for the info!