Negative horizontal margins
boxes with left margin
+30
+20
+10
0
-10
-20
-30
-40
-50
-60
-70
boxes with right margin
+30
+20
+10
0
-10
-20
-30
-40
-50
-60
-70
boxes with left margin and width
+30
+20
+10
0
-10
-20
-30
-40
-50
-60
-70
boxes with right margin, width, and auto left margin
+30
+20
+10
0
-10
-20
-30
-40
-50
-60
-70
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