fix(div): update class name to remove weird space afterwards (#763)

Signed-off-by: Aaron <29749331+aarnphm@users.noreply.github.com>

quartz/components/TableOfContents.tsx

@@ -1,6 +1,7 @@
 import { QuartzComponentConstructor, QuartzComponentProps } from "./types"
 import legacyStyle from "./styles/legacyToc.scss"
 import modernStyle from "./styles/toc.scss"
+import { classNames } from "../util/lang"
 
 // @ts-ignore
 import script from "./scripts/toc.inline"
@@ -19,7 +20,7 @@ function TableOfContents({ fileData, displayClass }: QuartzComponentProps) {
   }
 
   return (
-    <div class={`toc ${displayClass ?? ""}`}>
+    <div class={classNames(displayClass, "toc")}>
       <button type="button" id="toc" class={fileData.collapseToc ? "collapsed" : ""}>
         <h3>Table of Contents</h3>
         <svg