diff --git a/js/game.js b/js/game.js
index a00e7b6..6e23d9e 100644
--- a/js/game.js
+++ b/js/game.js
@@ -617,6 +617,7 @@ export class Level extends LevelInterface {
                                 }
                             }
                             else if (tile.type.on_power) {
+                                // FIXME this isn't quite right since there's seemingly a 1-frame delay
                                 add_to_edge_map(circuit.tiles, tile, DIRECTIONS[edge].bit);
                                 wired_outputs.add(tile);
                             }
diff --git a/js/main-editor.js b/js/main-editor.js
index 44b430a..e3b39c4 100644
--- a/js/main-editor.js
+++ b/js/main-editor.js
@@ -2097,6 +2097,10 @@ export class Editor extends PrimaryView {
     }
 
     setup() {
+        // Add more bits to SVG overlay
+        this.svg_cursor = mk_svg('rect.overlay-cursor', {x: 0, y: 0, width: 1, height: 1});
+        this.svg_overlay.append(this.svg_cursor);
+
         // Keyboard shortcuts
         window.addEventListener('keydown', ev => {
             if (! this.active)
@@ -2161,6 +2165,17 @@ export class Editor extends PrimaryView {
         window.addEventListener('mousemove', ev => {
             if (! this.active)
                 return;
+
+            let [x, y] = this.renderer.cell_coords_from_event(ev);
+            if (this.is_in_bounds(x, y)) {
+                this.svg_cursor.classList.add('--visible');
+                this.svg_cursor.setAttribute('x', x);
+                this.svg_cursor.setAttribute('y', y);
+            }
+            else {
+                this.svg_cursor.classList.remove('--visible');
+            }
+
             if (! this.mouse_op)
                 return;
             if ((ev.buttons & this.mouse_op.button_mask) === 0) {
diff --git a/style.css b/style.css
index e5cb07d..f5be779 100644
--- a/style.css
+++ b/style.css
@@ -1413,6 +1413,14 @@ body.--debug #player-debug {
     stroke-width: 0.0625;
     fill: none;
 }
+#editor .level-editor-overlay rect.overlay-cursor {
+    display: none;
+    stroke: hsla(225, 100%, 60%, 0.5);
+    fill: hsla(225, 100%, 75%, 0.25);
+}
+#editor .level-editor-overlay rect.overlay-cursor.--visible {
+    display: initial;
+}
 #editor .level-editor-overlay rect.overlay-cxn {
     stroke: red;
 }
@@ -1523,7 +1531,11 @@ body.--debug #player-debug {
 #editor .palette {
     isolation: isolate;
     grid-area: palette;
-    padding-right: 0.25em;  /* in case of scrollbar */
+    width: calc(32px * 8 + 4px * 9);
+    padding-right: 1em;  /* make room for scrollbar so we don't get a horizontal one */
+    /* TODO when there IS a scrollbar, the h2s are slightly narrower.  think this is an
+     * unexpected consequence of using min-content, which i guess does not take the
+     * possibility of a scrollbar into account */
     overflow-y: auto;
 }
 #editor .palette h2 {