some shuffling around in css

src/main/resources/static/stylesheet.css

@@ -1,4 +1,7 @@
 body {
+    --dark-grey: #717171;
+    --light-grey: #858585;
+
     margin: 0 5rem;
     font-family: sans-serif;
 
@@ -56,7 +59,7 @@ main {
     }
 
     .tag-block {
-        border: 1px solid ButtonText;
+        border: 1px solid var(--light-grey);
         border-left: .5rem solid AccentColor;
         padding: .2rem .2rem .2rem .5rem;
     }
@@ -67,11 +70,11 @@ main {
     }
 
     .low-key-hint, dt {
-        color: #717171;
+        color: var(--dark-grey);
     }
 
     h2 .low-key-hint {
-        color: #858585;
+        color: var(--light-grey);
     }
 }