WebKit desktop browsers add little up down arrows to number inputs called spinners. You can turn them off.

remove-spin-buttons.css

/**
*
* Turn Off Number Input Spinners
*
* http://trac.webkit.org/wiki/Styling%20Form%20Controls
* http://css-tricks.com/snippets/css/turn-off-number-input-spinners/
*
*/

input[type=number]::-webkit-inner-spin-button {
	-webkit-appearance: none;
}

input[type=number]::-webkit-outer-spin-button {
	-webkit-appearance: none;
	margin: 0;
}