How to remove selection-marker from webpage [duplicate]

This question already has answers here: How to remove the "Dotted Border" on clicking? (6 answers) 开发者_JAVA百科 Closed 8 years ago.

I like my websites to be beautiful. And I'm quite obsessive-compulsive about certain things. I need/want to remove the ugly dotted lines from the border of images upon clicking them. I don't want them to be visible. Dotted lines be gone!

Is this possible? Maybe with some javascript or jQuery?

Any help at all is appreciated.

Thank you!

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a { outline: 0; } /* CSS Code */