Creating a custom design for ng-bootstrap accordion using CSS styling

I've encountered an issue with my Angular 2 component that utilizes an accordion from ng-bootstrap. While the functionality works perfectly, I'm facing a problem with applying custom styles using the .card, .card-header, and .card-block classes on the accordion elements generated by ng-bootstrap.

These classes are directly set by ng-bootstrap when transforming the accordion into divs.

To apply my own CSS styles, I link a styles.scss file to the component's TypeScript file. However, despite my efforts, the styles don't seem to get applied to the elements, as seen in the rendered HTML output.

    <style>
        [_nghost-xfh-23]   .card[_ngcontent-xfh-23] {
          border: none; }

    [_nghost-xfh-23]   .card-header[_ngcontent-xfh-23] {
      margin-top: 0.75em !important;
      border: 1px solid rgba(0, 0, 0, 0.125); }

    [_nghost-xfh-23]   .card-block[_ngcontent-xfh-23] {
      text-align: left; }
    </style>

The styles.scss code snippet is as follows:

:host .card {
  border: none;
}

:host .card-header {
  margin-top: 0.75em !important;
  border: 1px solid rgba(0, 0, 0, 0.125);
}

:host .card-block {
  text-align: left;

}

It seems like Angular 2 tries to apply the styles during compilation, but the divs with the specified classes are created afterwards, preventing the styles from being applied.

Unfortunately, I am unable to edit bootstrap.css directly or create another global CSS file. I'm seeking a solution to reapply the CSS styles after the component loads or any alternative method to style ng-bootstrap accordions effectively.

If you have any insights or solutions to my dilemma, please share. Thanks! Best regards, Sy

Answer №1

According to the comment from @ChristopherMoore, the issue was related to Shadow DOM. By including /deep/, the problem was resolved. Check out the updated functional code below.

  /deep/ .card {
  border: none;
}

/deep/ .card-header {
  margin-top: 0.75em !important;
  border: 1px solid rgba(0, 0, 0, 0.125);
}

/deep/ .card-block {
  text-align: left

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