diff --git a/banner.js b/banner.js
index 2c1be6b..f548c12 100644
--- a/banner.js
+++ b/banner.js
@@ -150,6 +150,12 @@
       iconWrap.style.setProperty('width', 'auto', 'important');
       iconWrap.style.setProperty('max-height', 'none', 'important');
       iconWrap.style.setProperty('max-width', 'none', 'important');
+      // MUI's startIcon wrapper carries baked-in negative-left/positive-right
+      // margin (compensating for icon-font glyphs with their own internal
+      // padding); left over, it shifts the image into the container's left
+      // padding and stacks extra space on the right. Zero it so the
+      // container's own symmetric padding is the only thing spacing it.
+      iconWrap.style.setProperty('margin', '0', 'important');
     }
     Array.prototype.forEach.call(container.childNodes, function (node) {
       if (node === logoImg) return;