standarize configuration

assets/css/main.scss

@@ -37,6 +37,10 @@ main p a {
   color: var(--prime);
 }
 
+main p a:hover {
+  text-decoration: underline;
+}
+
 @keyframes showup {
   from {
     opacity: 0;

assets/css/pre.scss

@@ -34,6 +34,7 @@ hr {
   height: 0; /* 1 */
   color: inherit; /* 2 */
   border-top-width: 1px; /* 3 */
+  border-color: var(--grid, inherit);
 }
 
 /*

assets/css/syntax.scss

@@ -1,10 +1,11 @@
-.chroma code {
-  color: #d4d4d4;
+.chroma {
+  margin: .5em 0;
+  background-color: #222222;
+  border-radius: 2px;
 }
 
-.chroma {
-  background-color: #222222;
-  margin: .5em 0;
+.chroma code {
+  color: #d4d4d4;
 }
 
 /* LineTableTD */

assets/css/theme.scss

@@ -1,13 +1,15 @@
 .light {
-  --prime: #1691b6;
+  --prime: #3170a7;
   --grid: #e1e1e1;
   --back: #fff;
   --text: #222;
+  --code-back: #fff;
 }
 
 .dark {
-  --prime: #1691b6;
+  --prime: #3170a7;
   --back: #181818;
   --text: silver;
   --grid: #555;
+  --code-back: #222;
 }