Select Fields: Issues with size, placeholder on mobile, and selecting multiple

1. Looking for a way to customize the CSS of drop down select forms in CF7. I have two divs (left and right) set up with two columns of drop down forms. I would like them to be equal in size.

2. The placeholder on these select form appears to work fine on a desktop. But on mobile it shows up as “0 Items” for each select form. I’d like it to use the actual placeholder on mobile instead of this “0 Items” thing.

3. Although “multiple” is included in each drop down select form. You can only select multiple entries by using the “ctrl” key. I don’t trust users to know this and would like a way for them to just be able to click multiple selections without using the ctrl key.

Thanks so much in advance for your help!

The page I need help with: [log in to see the link]