I'm aware there are other questions relating to "show more" and "show less", but this is specifically looking at font size. I'm hoping this will be obvious to a javascript whizz (which I'm not!). I'm trying to set the font size of the "More" and "Less" part of the code (see fiddle). I assumed I'd do this in the CSS by adding a font-size like below, but this has no impact. Does anybody know what needs to be added/modified? Please note I'm not looking for the code to be Jquery, but pure JS like the Fiddle.
.hidden {
display: none;
font-size: 5px;
}