html - Styling an input type=number - Stack Overflow
Lea Verou on Twitter: "Hate how Chrome hides the spinner of an <input type="number"> until it's focus/hover? I always found it so annoying, given that the text underneath is clipped anyway. Fix
Numeric Inputs - A Comparison of Browser Defaults | CSS-Tricks - CSS-Tricks
A One Time Code Input compatible with Keyboard suggestion