Use 2 spaces for indentation in example CSS.

Author: ewilligers

css-grid-1/Overview.bs

@@ -669,12 +669,12 @@ Grid Areas
 		
 			/* using the template syntax */
 			#grid  {
-				display: grid;
-				grid-template-areas: ". a"
-						     "b a"
-						     ". a";
-				grid-template-columns: 150px 1fr;
-				grid-template-rows: 50px 1fr 50px;
+			  display: grid;
+			  grid-template-areas: ". a"
+			                       "b a"
+			                       ". a";
+			  grid-template-columns: 150px 1fr;
+			  grid-template-rows: 50px 1fr 50px;
 			}
 
 			#item1 { grid-area: a }