BlackTechDiva

I had the same problem. I just added this to the jetpack’s custom css plugin:

/*CHANGES COLOR OF THE SIDEBAR*/
body:after {
	background: #8b6876 !important;
}

.site-header {
	background: #8b6876 !important;
}

I changed my sidebar color to #8b6876. In the theme’s style.css it is set to #1abc9c.