CSS - TOC formatting

Source

I found this one on Reddit, posted by user stassinari.

Setup

Go to Settings, Appearance, and scroll all the way down to the CSS snippets section. You might already have some there, or not. It does not matter for us.

Click on the folder icon. This should open the local folder containing the snippets. Create a new file and give it a name that makes sense to you. For example, TOC formatting.css. Make sure that the file extension is css. If you don't see your file extensions, click on View, Show, and File name extensions (in Windows Explorer).

Now open the file and copy the CSS code below into it. Save the file, go back to Obsidian and refresh the list of snippets. Enable the TOC formatting one, and that should do it. If it does not, you may have to restart Obsidian.

Result

With this snippet, the outline view in Obsidian will use the same colors for each heading level as in your actual note. The colors themselves can be customized via your theme settings or with yet another CSS snippet.

Code

:root {
    --h1-color: #7dd3fc;
    --h2-color: #a78bfa;
    --h3-color: #e879f9;
    --h4-color: #34d399;
    --h5-color: #facc15;
    --h6-color: #60a5fa;
  }
  
  [data-type="outline"] {
    /* h1 */
    .tree-item > .tree-item-self {
      color: var(--h1-color);
    }
  
    /* h2 */
    .tree-item .tree-item > .tree-item-self {
      color: var(--h2-color);
    }
  
    /* h3 */
    .tree-item .tree-item .tree-item > .tree-item-self {
      color: var(--h3-color);
    }
  
    /* h4 */
    .tree-item .tree-item .tree-item .tree-item > .tree-item-self {
      color: var(--h4-color);
    }
  
    /* h5 */
    .tree-item .tree-item .tree-item .tree-item .tree-item > .tree-item-self {
      color: var(--h5-color);
    }
  
    /* h6 */
    .tree-item .tree-item .tree-item .tree-item .tree-item .tree-item > .tree-item-self {
      color: var(--h6-color);
    }
  }