How to make a div with no content have a width?

Question

I am trying to add a width to a div, but I seem to be running into a problem because it has no content.

Here is the CSS and HTML I have so far, but it is

Answer 1

I had the same issue. I wanted icons to appear by pressing the button but without any movement and sliding the enviroment, just like bulb: on and off, appeared and dissapeared, so I needed to make an empty div with fixed sizes.

width: 13px;
min-width: 13px;

did the trick for me