silverstripe-blog/scss/blog.scss

.no-sidebar .content-container.size3of4 {
    width: 75%;
}

.blog-entry .post-image img {
    width: 98.75%;
}

.blog-sidebar .WidgetHolder ul {
    margin-left: 0;
	
	li {
        list-style-type: none;
    }
}