In the web version of solvespace, hitting Ctrl-minus will make the font smaller, but hitting Ctrl-plus (well, Ctrl-equals, the standard convention to avoid making people hit shift) doesn't make the font larger.

Please pass through Ctrl-equals to the browser as well, so that it's easy to make the text larger or smaller in order to be readable.

(Ctrl-scrolling will zoom in and out, if the mouse is placed over the right sidebar or the menu bar rather than the content area.)