Need to remove form css on single page

I am trying to see if I can get whmcs-bridge plugin to work with Highend theme. It’s working well, with the exception of forms. The Highend CSS is overpowering the WHMCS template’s CSS and making forms look weird. The main problem child is hb-custom-select.

I can do per-page custom CSS through Visual Composer, and I was wondering if there’s any way I can tell it to ignore the form CSS on that particular page. From what I know about css, this doesn’t sound like it could work, but thought it was worth asking anyway.

Thanks.