style: styling for codeblocks without langs (#527)

Jacky Zhao

2023-10-05 afa163f2fe9c52d4b3bf1a2e4d48887916b67c24

 quartz/components/Explorer.tsx

@@ -86,7 +86,7 @@
  function Explorer({ allFiles, displayClass, fileData }: QuartzComponentProps) {
    constructFileTree(allFiles)
    return (
      <div class={`explorer ${displayClass}`}>
      <div class={`explorer ${displayClass ?? ""}`}>
        <button
          type="button"
          id="explorer"