Since Safari 15, the tab is automatically tinted in the same color as the most used color of the website you are currently visiting.
As a result, the top part of the tab takes on the same color. This can make for a good reading experience because the top part of Safari is less noticeable. However, it can also be very annoying for people who do not have the best vision. It is also annoying if you don't like the color of the website anyway.
You can disable auto-tinting of the tab bar in Safari. In this tip I explain how to disable the color in the tab bar for macOS.
Disable tab colors in Safari
Open the Safari browser. Click on Safari at the top left. Then click on Preferences.
Then click on the tab: Tabs. Then disable the option: Show color in tab bar.
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I hope this helped you. Thank you for reading!