fix: code when adding linenos

sass/parts/_code.scss

@@ -1,4 +1,5 @@
 pre {
+    position: relative;
     font-family: var(--mono-font);
     padding: 1.25rem;
     border-radius: var(--standard-border-radius);
@@ -6,11 +7,45 @@ pre {
     border-color: var(--overlay0);
     border-width: 0.15rem;
     line-height: initial;
-    overflow-x: scroll;
+    overflow: hidden;
+    overflow-x: auto;
 
     &>code {
         background-color: initial;
         border: initial;
+        padding: 0;
+    }
+
+    &[data-linenos] {
+        padding: 1.25rem 0;
+    }
+
+    table {
+        width: 100%;
+        border-collapse: collapse;
+        margin: 0;
+
+        th,
+        td,
+        tr {
+            border: none;
+            padding: 0
+        }
+
+        td:nth-of-type(1) {
+            text-align: center;
+            vertical-align: top;
+            user-select: none;
+            color: var(--overlay1);
+        }
+
+        tr:nth-child(even) td {
+            background-color: inherit;
+        }
+    }
+
+    mark {
+        display: block;
     }
 }