Update stylesheet.css

stylesheet.css

@@ -20,16 +20,16 @@ td {
 
 /*Question 5a*/
 #header-row {
-    background-color: white;
+    background-color: red;
 }
 
 /*Question 5b*/
 .rows {
-    background-color: white;
+    background-color: red;
 }
 
 /*Question 5c*/
 button {
-    margin: 5px;    
+    margin: 8px;    
     padding: 5px;
 }
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