Styled checkboxes. Now we will combine all these in one code and will have our checkbox ready. Available as a cloud-hosted subscription or installable software. How to make Horizontal checkbox controlgroups using jQuery Mobile ? The height property sets the height of checkbox and width property sets the width of the checkbox. Method 1: The checkbox size can be set by using height and width property. The line that the thumb moves across is called the track. A styled input on an invisible track (WebKit/Blink) or an unstyled track (Firefox and IE) Styling the Track.