[css-timing-1] Tweak timing function diagrams

Author: birtles

css-timing-1/Overview.bs

@@ -57,12 +57,12 @@ input progress value and producing a corresponding transformed output progress
 value.
 
 <figure>
-  <img src="timing-function-example.svg" width="350"
+  <img src="timing-function-example.svg" width="400"
     alt="Example of a timing function that produces an ease-in effect.">
   <figcaption>
-    Example of a timing function that produces an ease-in effect.
+    Example of a timing function that produces an ease-in effect.<br>
     Given an input progress of 0.7, the timing function scales the
-    value to produce an output progress of 0.52.
+    value to produce an output progress of 0.52.<br>
     By applying this timing function, the animation will progress more
     slowly at first but then gradually progress more quickly.
   </figcaption>