[css-color-5] Force a text color for the deltaE table, as the chosen colors are light and assume black text

Author: tabatkins

css-color-5/Overview.bs

@@ -40,7 +40,7 @@ spec:css-color-4; type:value; text:rec2020
 </pre>
 <link rel="stylesheet" href="style.css" />
 <style>
-	table.deltaE td {border: 4px solid white; padding: 6px; font-size: 1.4em;}
+	table.deltaE td {border: 4px solid white; padding: 6px; font-size: 1.4em; color: black;}
 	table.deltaE td.dE0 { background: rgb(68, 243, 91)}
 	table.deltaE td.dE1 { background: rgb(153, 243, 68)}
 	table.deltaE td.dE2 { background: rgb(217, 243, 68)}