Better margins

src/main.tex

@@ -1,11 +1,15 @@
+\RequirePackage{fix-cm}
 \documentclass[
+    fontsize=11pt,
     paper=a4,
     pagesize,
     bibliography=totoc,
     headings=big,
     captions=tableheading,
     chapterprefix=true,% like in standard class "report"
-    BCOR=2cm,
+    BCOR=1cm,
+    DIV=12,
+    headsepline=true,
 ]{scrbook}
 
 \usepackage{commands}