Nothing changed after adding the last code
H2 tag is still oversized
Hello @daintyg,
Thanks for asking. 
Please try out following CSS under X > Theme Options > CSS and see how it goes:
body.single-post h2 {
font-size: 150% !important;
}
If you would like to learn CSS, I am sharing few resources that you take a look to get started with CSS and an interesting tool that you can use to speed up the development process.
I recommend you to watch following video that will help you to get started with CSS.
Sometimes it can get a bit difficult to find out the right selector to be able to write the required CSS codes. A handy tool that can help you in this is Google Chrome dev tools. I am sharing the resource that you can refer to get started with dev tools.
https://developers.google.com/web/tools/chrome-devtools/css/
Thanks.
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