body.single-post .site-content .content-area {
    width: 100% !important;
}

body.single.single-post .site-content .content-area {
	margin:auto;
}

.is-right-sidebar {
	width:25%;
}

@media(max-width:900px) {
	.site-content .content-area,.is-right-sidebar {
		width:100%;
	}
}