Does styling the scrollbar affect UX? [duplicate]

1. Why is the scrollbar important?
2. How do I make my scrollbar not affect width?
3. Are scrollbars necessary?
4. How do I style the scrollbar in cross browser?

Why is the scrollbar important?

The sole purpose of a standard scroll bar is to enable the user to generate scrolling requests for viewing the entire content of the client area.

How do I make my scrollbar not affect width?

The easy fix is to use width: 100% instead. Percentages don't include the width of the scrollbar, so will automatically fit. If you can't do that, or you're setting the width on another element, add overflow-x: hidden or overflow: hidden to the surrounding element to prevent the scrollbar.

Are scrollbars necessary?

A scrollbar is needed in instances where there are a lot of items in a dropdown menu. The general rule is that only 6 to 10 items should be visible in the dropdown.

How do I style the scrollbar in cross browser?

Your best bet for styling scrollbars in CSS, for as much cross-browser support as possible, is to use the special ::webkit prefixed scrollbar CSS properties (Chrome & Safari will need those for now) and the standardized scrollbar-width and scrollbar-color properties (for Firefox for now).