[css-color-5][editorial] Fixed Bikeshed warning

Author: SebastianZ

css-pseudo-4/Overview.bs

@@ -368,7 +368,8 @@ First-Letter Text: ''::first-letter'' pseudo-element and its ''::prefix'' and ''
   </wpt>
 
   <div class="figure">
-    <img alt="A drop-cap initial letter, including the opening quotation mark before it." src="images/first-letter2.gif">
+    <img src="images/first-letter2.gif" width="114" height="72"
+         alt="A drop-cap initial letter, including the opening quotation mark before it.">
   </div>
 
   The <dfn>::first-letter</dfn> [=pseudo-element=] represents