Safari 14.0.2 showing my website with bright green colour
Hi I have just upgraded my MBA to Big Sur and, using Safari to look at one of my websites, the text has a bright green background colour added. Chrome on the same machine works fine. Safari 14.0.2 on Catalina and on iPhone etc also work fine. Please see the screenshots for what I mean. I have scratched my head and searched for a solution but can find nothing. Help and thanks in advance!!
MacBook Air