diff --git a/lib/hterm.js b/lib/hterm.js
index 66480135..1eed1571 100644
--- a/lib/hterm.js
+++ b/lib/hterm.js
@@ -147,7 +147,7 @@ hterm.Terminal.prototype.setFontSize = function (px) {
   unicodeNodeStyle.innerHTML = `
     .unicode-node {
       display: inline-block;
-      vertical-align: top;
+      vertical-align: middle;
       width: ${this.scrollPort_.characterSize.width}px;
     }
   `;