Change font size of blog post title

I’m trying to change the size of each blog post title, but can’t seem to make it work. I used custom CSS

.single .entry-title {
font-size: 22px;
}

and

.entry-title {
font-size: 30px;
}

to change it here: https://eventmarketingstars.com/blog/, but it doesn’t change the size in each individual blog post (like here: https://eventmarketingstars.com/2019/02/20/experiential-marketing-in-b2b/).

Also, the same page has a different font (smaller size) for bullet points and neither

p, ul, ol {
font-size:16px;
}

nor
.entry-content {
font-size: 16px;
}

Has fixed the problem. Any ideas how to update these?