What CSS Style is this Text?

It is the blog page title…assuming you want to make it the same as your other page titles, try adding this to your current custom css:
.blog #content .entry-header .entry-title
Like this:

.single #content .entry-header .entry-title, .page #content .entry-header .entry-title, .blog #content .entry-header .entry-title {
font-size: 30px;
color: #008dcc;
}

This snippet can help in determining the elements, other browsers have similar tools.

[Edit] However…to simplify things, try changing the above to this, this should cover all page titles:

#content .entry-header .entry-title {
font-size: 30px;
color: #008dcc;
}