[Theme: onetone] section custom

Hello there. First of all – thanks for the theme!

I’m new to CSS so I would be really grateful, if you could assist me with this matter. I can’t find a way to make the last, custom section with everything in it fixed in one place smaller: to reduce the height. When I’ve tried to do this here:

.section,.section-about,.section-services,.section-portfolio,.section-contact,.section-custom {
	clear:both;
	width:100%;
	/*min-height:690px;
	overflow:hidden;
	*/
}

by typing below the width:

height:300px;

and all other sections became smaller to.

When I’ve tried to delete .section-custom from the above and wrote the next:

.section-custom {
	height:300px;
}

nothing happend 🙁

Nevertheless, this way was good for .section-banner and .section-about. But I don’t see any difference among these sections.

Help me, please.

Thank you in advance!