[css-round-display] Update minor details

Author: Jihye Hong

css-round-display/Overview.bs

@@ -253,7 +253,7 @@ The example below shows how the 'border-boundary' property works on drawing bord
     <div id="blueBox"></div>
 </div>
 </pre>
-
+<br />
 <div style="width: 600px; text-align:center">
     <div style="float: left; width: 300px;">
         <img style="width: 200px" src="images/border_b.png">
@@ -315,7 +315,7 @@ Another example bellow shows the result in Figure 6B.
 	background-color: green;">&lt;/div>
 &lt;/body>
 </pre>
-
+<br />
 <div style="width: 600px; text-align:center">
 	<div style="float: left; width: 300px;">
 		<img style="width: 250px" src="images/polar_positioning_a.png">
@@ -324,10 +324,10 @@ Another example bellow shows the result in Figure 6B.
 	<div style="float: left; width: 300px;">
 		<img style="width: 250px" src="images/polar_positioning_b.png">
 		<p>(B) Deploying elements using polar coordinate system</p>
-	</div>
-	<div style="width: 600px">
-		<p class="caption">Positioning elements in conventional coordinate system and polar coordinate system</p>
-	</div>
+	</div>	
+</div>
+<div style="width: 600px">
+	<p class="caption">Positioning elements in conventional coordinate system and polar coordinate system</p>
 </div>
 </div>