add table alternate row styling

core/css/theme.css

@@ -17,6 +17,8 @@
 	--secondary-container-background: #cacaca;
 	--secondary-container-border: 2px outset #c1c1c1;
 	
+	--table-alternate: #dbdbdb;
+	
 	--header-bg: #ffffff;
 	--header-text: #000000;
 	--header-line: 2px solid #000000;

core/style.css

@@ -57,6 +57,10 @@ textarea, input {
 	box-sizing: border-box;
 }
 
+table.alternating tr:nth-of-type(even) {
+	background: var(--table-alternate);
+}
+
 @media only screen and (orientation: landscape) {
 	:target::before {
 		content: "";