How to Effectively Style the `mat-select` Panel in Angular Material?

Styling mat-select Panel in Angular Material

In Angular Material, styling the mat-select panel component can be achieved through various approaches. Despite setting the panelClass attribute, you may encounter styling issues. This article addresses this challenge and provides effective solutions.

Using ::ng-deep (Shadow-Piercing Descendant Combinator)

This method allows you to force styles down through child components using the ::ng-deep combinator. However, note that its support is being removed from browsers, and it's recommended to use ::ng-deep for broader compatibility.

::ng-deep .mat-select-content {
    width: 2000px;
    background-color: red;
    font-size: 10px;
}

Using ViewEncapsulation None

By setting the view encapsulation mode to None, you disable Angular's encapsulation and allow styles to affect the entire application.

<code class="typescript">@Component({
    ...,
    encapsulation: ViewEncapsulation.None
})</code>

<code class="css">.mat-select-content {
    width: 2000px;
    background-color: red;
    font-size: 10px;
}</code>

Setting Class Style in style.css

Enforce styles with !important to override Angular's internal styles.

<code class="css">.mat-select-content {
    width: 2000px !important;
    background-color: red !important;
    font-size: 10px !important;
}</code>

Using Inline Styles

Apply styles directly to the mat-option element.

<mat-option style="width: 2000px; background-color: red; font-size: 10px;">

Additional Notes for Angular 9

For Angular versions 9 and above, the CSS class name for the select list content has changed to mat-select-panel. Therefore, use the following syntax:

<code class="css">.mat-select-panel {
    background: red;
    ....
}</code>

Consider trying these methods to style mat-select effectively and resolve styling issues you may encounter.

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