feat: might be actually feature-complete by now

styles/kewt.css

@@ -252,8 +252,27 @@ hr {
     border-top: 1px solid var(--code-border);
 }
 
+.nav-toggle, .nav-toggle-label {
+    display: none;
+}
+
 @media screen and (max-width: 600px) {
+    header {
+        display: flex;
+        justify-content: space-between;
+        align-items: center;
+    }
+
+    .nav-toggle-label {
+        display: block;
+        font-size: 30px;
+        cursor: pointer;
+        color: var(--fg-heading);
+        user-select: none;
+    }
+
     #side-bar {
+        display: none;
         position: relative;
         top: auto;
         left: auto;
@@ -264,6 +283,10 @@ hr {
         margin: 0 20px 20px 20px;
     }
 
+    .nav-toggle:checked ~ #side-bar {
+        display: block;
+    }
+
     article {
         margin: 0 20px 0 20px;
     }