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Landscape phone issues

First 2 websites I made worked fine in phone landscape view. I’m doing a third one now and having issues with landscape. Everything I add to the site (containers, divs, etc) all show up on the landscape mode, but its like the css doesn’t carry over. An example being creating a section with a black background, 90% width, and paragraph with white text. This will show up on all views, but when I switch to landscape phone, any text or images I placed are there, but everything is defaulted as if the styles I added aren’t recognized by it. Currently I have been just re-entering it in when designing in the landscape view, but it is time consuming, and I have no clue whats happening to the code if i do that. Any suggestions would be very helpful, thanks.