diff --git a/web_src/js/markup/math.js b/web_src/js/markup/math.js
index d4e40d5be..cfd058c93 100644
--- a/web_src/js/markup/math.js
+++ b/web_src/js/markup/math.js
@@ -1,6 +1,6 @@
 function displayError(el, err) {
   const target = targetElement(el);
-  target.remove('is-loading');
+  target.classList.remove('is-loading');
   const errorNode = document.createElement('div');
   errorNode.setAttribute('class', 'ui message error markup-block-error mono');
   errorNode.textContent = err.str || err.message || String(err);
@@ -23,13 +23,15 @@ export async function renderMath() {
 
   for (const el of els) {
     const source = el.textContent;
-    const nodeName = el.classList.contains('display') ? 'p' : 'span';
+    const displayMode = el.classList.contains('display');
+    const nodeName = displayMode ? 'p' : 'span';
 
     try {
       const tempEl = document.createElement(nodeName);
       katex.render(source, tempEl, {
         maxSize: 25,
         maxExpand: 50,
+        displayMode,
       });
       targetElement(el).replaceWith(tempEl);
     } catch (error) {