Quote and invoice public view font to small

Support
1

Just upgraded to 1.3.1 and when I click on guest link it opens Public view quote/invoce. But now the font is too small. I know I can add something in custom.css but I don’t know what. I can’t find what css I have to add for all fonts larger in Public view. Can you help me, on every upgrade I loose all day to polish the pdf templates and public views like it was before an upgrade…

2 
#invoice-container {
    font-size: 1.4em;
            }

added this to custom.css.