Theme Horse

Hi Tomstrain,

To eliminate the space between the left sidebar and the main content first remove the CSS code that you have edited in the main style.css and Go to Appearance -> Theme Options/Customize -> Design Options Tab -> Custom CSS paste the following CSS code and Click on save all changes button:

#primary {
    width: 76%;
}
#secondary {
    width: 20%;
}
@media only screen and (max-width: 1078px) {
	#primary, #secondary {
	   width: 100%;
	}
}

Thank you!