Need to widen product-option-button and add-to-cart-button on mobile

Hi, 

I need to make the option buttons and the add-to-cart button on my product pages wider. 

I want them to be as wide as the page is with a little white space left and right. 

I already tried with some code myself but haven't found a sufficient solution. 

Thanks for your help, 

PS: You can find the products under "Schöne Dinge" or here is a direct link to a product page: 

https://www.studioachtpunktnull.de/shop/p/nyc-bild-1-43r27-9s3ax-x99yp-s7t22-3e4zh-zjge9-fk64g-9df83-cmlg5-6myf9-2kp2c-xtce6-2zzn6-fcp6p-w6zmr-swgzd-87asl-mfhcb-6gdpr-8ke22-42bm3-x5ca8

Does anybody know why the link is so long? The only difference to my other products that appear normal is that this product has two different drop down options ...

13 minutes ago, Berlin2023 said:

Does anybody know why the link is so long?

The link is so long probably because you have duplicated a product and then duplicated the duplicate 22 times each time without updating the URL slug. 

The reason the elements are too narrow is because of this CSS with width:50%; have you added that into Custom CSS?

22 hours ago, Ziggy said:

The link is so long probably because you have duplicated a product and then duplicated the duplicate 22 times each time without updating the URL slug. 

 Thank you for the tip! I've now changed all the product URL slugs individually and will keep your tip in mind for the future.

22 hours ago, Ziggy said:

The reason the elements are too narrow is because of this CSS with width:50%; have you added that into Custom CSS?

Yes, I added that some time back but it did not work as I intended it to so I deleted it. Now it doesn't show up in my CSS editor anymore. How can I properly remove it?

Thanks! 

Thank you both @Ziggy and @Web_Solutions for your help! 

I very much appreciate it!

1 minute ago, Berlin2023 said:

Thank you both @Ziggy and @Web_Solutions for your help! 

I very much appreciate it!

Welcome and have a great day!