The button has a gray border that is ugly. How to remove it?

I used the dialog in closure and drew a dialog with a close button beyond the upper right corner. I found that when the button popped up, it had a gray border, which was ugly. Sometimes the border disappeared after repeated operations. I always thought it was a problem with closure. Later, I used Firefox to see that the border was a rectangular virtual border that included the dialog and the close button, so it felt like the effect after focus. I googled html focus border and the problem was solved: outline:none

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The button has a gray border that is ugly. How to remove it?

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