small fixes and adjustments

styles/main.css

@@ -52,10 +52,6 @@
   border-top: 4px solid light-dark(var(--color-header-light), var(--color-header-dark));
 }
 
-.divider {
-  padding: 0 1rem;
-}
-
 /* Body */
 body {
   font-family: sans-serif;
@@ -75,8 +71,7 @@ a:visited {
 }
 
 /* Focus */
-*:focus,
-a:focus {
+*:focus-visible {
   outline: 3px solid light-dark(var(--color-header-light), var(--color-header-dark));
   outline-offset: 2px;
   background-color: light-dark(var(--color-header-light), var(--color-header-dark));
@@ -88,8 +83,7 @@ h3 a:visited {
   background-color: light-dark(var(--color-header-light), var(--color-header-dark));
 }
 
-h3 *:focus,
-h3 a:focus {
+h3 *:focus-visible {
   outline: 3px solid light-dark(var(--color-text-light), var(--color-text-dark));
   background-color: light-dark(var(--color-text-light), var(--color-text-dark));
 }
@@ -138,19 +132,19 @@ h1 {
 
 @media (min-width: 650px) {
   h1 {
-    margin: 5rem 0 2rem 0;
+    margin: 5rem 0 2rem;
   }
 }
 
 h2 {
   font-size: 2rem;
-  padding: 3rem 0 0 0;
+  padding: 3rem 0 0;
   border-top: solid;
 }
 
 h3 {
   font-size: 1.4rem;
-  margin: 1rem 0 0 0;
+  margin: 1rem 0 0;
 }
 
 /* dl/dt/dd */