Styling Form Controls with CSS | www.HTMLGoodies.com
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padding for input, button and textarea · Issue #729 · necolas/normalize.css · GitHub
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Bootstrap 3, how to reduce the padding of text in input element? - Stack Overflow
padding for input, button and textarea · Issue #729 · necolas/normalize.css · GitHub
Text fields - Components - Material Design
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html - Padding inside an input without affect the width - Stack Overflow