[css-box-3][editorial] Fixed Bikeshed errors

Author: SebastianZ

css-box-3/Overview.bs

@@ -17,6 +17,7 @@ Ignored Terms: internal table elements, block layout
 Issue Tracking: CSSWG GitHub https://github.com/w3c/csswg-drafts/issues
 </pre>
 <pre class='link-defaults'>
+spec:css-backgrounds-3; type:property; text:border
 spec:css-sizing-3; type:dfn; text:size
 </pre>
 
@@ -125,7 +126,7 @@ The CSS Box Model {#box-model}
 
 	<div class="figure">
 		<p><img src="images/box.png" alt="Diagram of a typical box, showing the
-		content, padding, border and margin areas">
+		content, padding, border and margin areas" width="461">
 
 		<p class="caption">The various areas and edges of a typical box.
 	</div>