First lines - current settings, second - what I propose.
1. #body { z-index:1; position:relative; background:rgba(220,231,248,0.8); }
#body { z-index:1; position:relative; background:rgba(220,231,248,0.95); }
2. #sidebar-news > a { display:block; padding:15px; color:rgba(255,255,255,.4); text-decoration:none; }
#sidebar-news > a { display:block; padding:15px; color:rgba(255,255,255,.8); text-decoration:none; }
3. #sidebar-news > a > h4 { margin:0 0 5px 0; color:rgba(28,180,236,.5); }
#sidebar-news > a > h4 { margin:0 0 5px 0; color:rgba(28,180,236,.7); }
4. #sidebar > h3.blue { color:rgba(28,180,236,.5); }
#sidebar > h3.blue { color:rgba(28,180,236,.7); }
@OderWat: Thank you.
@dom96: Breadcrumb color breaks, so it should be white, black or blue (as nickname color)