[html] Removing newline after <h1> tags?

I am having a problem with removing linebreaks after the <h1> tag, as everytime it prints, it adds a line break straight after it, so something like <h1>Hello World!</h1> <h2>Hello Again World!</h2> prints out like this:

Hello World!

Hello Again World!

I am unsure on what tags I need to change in CSS, but I expect it's something to do with the padding or margins

I also want to keep the vertical padding if at all possible.