Hi @stobot -- first thing to check, without actually delving into which 
styling affects the heading, is: your stylesheet needs a dot before a class 
name: 

.tc-site-title { font-size: 0.5em; }

For the tiddler title, since there are other things than the title in the 
titlebar, we want to select the h2 within it specifically:

.tc-titlebar h2 {
    font-size: 0.7em;
}

Hope that helps,

Chris
On Monday, August 16, 2021 at 8:59:09 AM UTC-4 Stobot wrote:

> I'm trying to figure out how to reduce the size of the titlebar via CSS 
> (including the buttons) and am stuck trying to understand how the CSS works.
>
> In developer tools when I inspect the area, I see this (below). When I 
> uncheck the font-size there, it actually gets bigger and doesn't seem to 
> affect the buttons
> [image: image.png]
>
> And then when I uncheck the font-size here - it greatly shrinks it (yay) 
> but *way too much*
> [image: image.png]
>
> My poor understanding of CSS made me think that the strikeout meant that 
> it was overridden by something else anyways, but it seems to change things 
> - oh well.
>
> Question is what I can add to a tiddler tagged with the $:/tags/Stylesheet 
> to reduce the size a bit? I'm trying this and it's not doing anything...
>
> tc-site-title { font-size: 0.5em; }
>
> tc-titlebar { font-size: 0.5em; }
>

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