External CSS styling does not appear to be affecting the Shadow DOM in Google Chrome

I am currently utilizing polymer's paper-action-dialog and paper-button components on my webpage. Within the paper-action-dialog element, there are two paper-buttons. I am looking to style these paper-buttons externally (in the main HTML file). I have written my CSS styles using shadow DOM notation. While these styles are functioning as expected in Firefox, they are not displaying correctly in the Google Chrome browser. What steps can I take to ensure the styling works in Chrome?

Markup

<paper-action-dialog class="ask" backdrop autoCloseDisabled=true heading="Heading!">
  <p>This is a sample paragraph.</p>
  <paper-button  autofocus class="test" affirmative>Edit</paper-button>
  <paper-button  autofocus class="test" affirmative>OK</paper-button>
</paper-action-dialog>

CSS

paper-action-dialog::shadow paper-button.test{
            font-size: small;
            height: 100%;
            padding-top: 5px;
            width: 100%;
            margin: 0 0;
}

EDIT:

The solution can be found in the comment below:

The correct selector should be

overlay-host::shadow paper-button.test

Answer №1

To understand the structure of the webpage, it is recommended to explore the DOM using the browser console (F12) or by right-clicking and selecting 'inspect element'. The HTML code for the specific dialog may be inserted somewhere in the body tag and not directly within the <paper-action-dialog> element. Thus, it is necessary to adjust the selectors appropriately to target the correct elements.

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