Custom styled drop down breaking container

Shouldn't my custom select class that's positioned relative handle keeping this chevron within the border? I could give it another class with the same styles and move it in a bit, I just don't know why it's doing this. https://6575841-hs-sites-com.sandbox.hs-sites.com/gallery-hubdb-0?hs_preview=wEzHfVuf-85747084463