Designing Button States – Cloud Four
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How to remove the blue border/outline in Chrome & Safari, and dotted line in Firefox & Edge without effin' up the UX | by Ricardo Zea | Medium
Button in CSS | Guide to Button in CSS with Some Property Declarations
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CSS remove hazy blue border from link in Chrome, prefer Firefox method - Stack Overflow
How To Style Common Form Elements with CSS | DigitalOcean
CSS Disable Button
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Making Disabled Buttons More Inclusive | CSS-Tricks - CSS-Tricks
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css - How to remove blue outline of select option in Twitter Bootstrap - Stack Overflow
evergreen-buttons outline · Issue #10 · segmentio/evergreen · GitHub
Building a button component
