Mobile devices problem!

Can you post a link to your site?

What in particular doesn’t look right to you? The only thing that jumps out to me is the section headings overflow the window width, which you could fix with some custom CSS:

@media only screen and (max-width: 767px) {
	.intro h2 {
		font-size: 56px;
	}
}

If you’re on WordPress 4.7, you could use the built-in custom CSS option at Dashboard > Appearance > Customize > Additional CSS; otherwise, you could either use a custom CSS plugin or a child theme.