It's this:
.single-format-standard h1 { font-size: 260px; line-height: 1.1em;
margin-bottom: 10px;}
on line 53. Your line-height is using em's, which means it's based on that
font-size of 260px (woah!). Line-height doesn't need units:
http://meyerweb.com/eric/thoughts/2006/02/08/unitless-line-hei
I've noticed a problem with how my header displays on individual blog post
pages when the site is viewed on a smartphone. It's a WP responsive
template. The media queries defining both seem to be the same (unless I'm
missing something, which is possible). Here is an example of what it looks
like:
