[css-forms-1][editorial] Fixed Bikeshed warnings

Author: SebastianZ

css-forms-1/Overview.bs

@@ -104,8 +104,8 @@ spec:css-forms-1; type:value; for:/; text:::placeholder
 
   Here are the [=basic appearance=] colors inheriting respectively the default light and dark mode colors from the root element:
 
-  <img src="images/base-screenshot.png" style="width: 50%; height: auto;" alt="Screenshot of the basic appearance with a light color scheme">
-  <img src="images/base-screenshot-dark.png" style="width: 50%; height: auto;" alt="Screenshot of the basic appearance with a dark color scheme">  
+  <img src="images/base-screenshot.png" width="400" height="437" style="width: 50%; height: auto;" alt="Screenshot of the basic appearance with a light color scheme">
+  <img src="images/base-screenshot-dark.png" width="400" height="437" style="width: 50%; height: auto;" alt="Screenshot of the basic appearance with a dark color scheme">
 
 ### Color/Font Customization ### {#custom}
 
@@ -124,7 +124,7 @@ spec:css-forms-1; type:value; for:/; text:::placeholder
     }
     </pre>
 
-    <img src="images/base-example-1.png" style="width: 100%; height: auto;" alt="Screenshot of a customized basic appearance with brown text and a pale yellow background">
+    <img src="images/base-example-1.png" width="775" height="848" style="width: 100%; height: auto;" alt="Screenshot of a customized basic appearance with brown text and a pale yellow background">
   </div>
 
   <div class="example">
@@ -141,7 +141,7 @@ spec:css-forms-1; type:value; for:/; text:::placeholder
     }
     </pre>
 
-    <img src="images/base-example-2.png" style="width: 100%; height: auto;" alt="Screenshot of a customized basic appearance with green text and a black background">
+    <img src="images/base-example-2.png" width="775" height="863" style="width: 100%; height: auto;" alt="Screenshot of a customized basic appearance with green text and a black background">
   </div>
 
 # Styling Pickers # {#pickers}
@@ -1085,7 +1085,7 @@ These styles should apply when the select is a [list box](https://html.spec.what
 
 ```css
 select {
-	overflow: auto;
+  overflow: auto;
   display: inline-block;
   block-size: calc(max(24px, 1lh) * attr(size type(<integer>), 4));
 }