CSS for "Info" content

Where does the styling for the "Info" contents come from?
By default the style is
.semanticui-body small {
font-size: 80%;
}
If I add the following to custom.css, nothing changes
.semanticui-body small {
font-size: 100%;
}
There is no server/site cache enabled.
No browser cache enabled.
​
On a desktop the font size 80% doesn't cut it at all.
Thanks

Hi yerg,
​
Please try font-size: 100% !important;
​
Bob

Already added the following to the custom.css
It gets ignored.
Where else I can edit core CSS?
​
.semanticui-body small {
font-size: 100%;
}

HI yerg,
​
Please check my last post - the !important part is important.
​
Bob

Blind
Thanks