Probably it's too late, but it's good to add normalize.css. It makes browsers render all elements more consistently and in line with modern standards. Without it pages may look unexpected differently. And they look differently now as I see. Difference is not huge, but when designer will check your work in real world, they will note such things.
If you think that adding normalize will be too difficult now, you can just check similarity in all browsers and fix differences.
BrowserShots.org, Browserling.com, BrowserStack, LambdaTest, CrossBrowserTesting
Probably it's too late, but it's good to add normalize.css. It makes browsers render all elements more consistently and in line with modern standards. Without it pages may look unexpected differently. And they look differently now as I see. Difference is not huge, but when designer will check your work in real world, they will note such things.
If you think that adding normalize will be too difficult now, you can just check similarity in all browsers and fix differences. BrowserShots.org, Browserling.com, BrowserStack, LambdaTest, CrossBrowserTesting