Change font size in drop down box

I have a dropdown question in my contact form. When I activate the dropdown to see my options the font is way bigger then the rest of the fonts on the page and I cant see all of the words in one of the options. I've been told the only way to fix this is with code. Has someone had a similar problem/solution?

Thanks!

Can you share link to this page? We can check easier

Of course, thanks. 

https://www.jonespsychotherapy.com/contact

Try adding this code to Website > Website Tools > Custom CSS
 

.select select * {
    font-size: 12px !important;
}