That background color is coming from the #head-wrap, so you’d need to remove it from the other code –
.epik-blue #head-wrap,
.epik-blue #welcome,
.epik-blue #home-feature-bg-dark,
.epik-blue .author-box,
.epik-blue .footer-widgets {
background: none repeat scroll 0 0 #1887e5;
color: #ddd;
}
Although the new version of Epik makes this easier to do….but don’t do the automatic upgrade if you’ve made a lot of css customizations.