How to Style the mat-select Panel in Angular Material: A Guide to Different Techniques

Styling mat-select's Panel in Angular Material

To style the mat-select panel, you can specify a custom panelClass in the HTML markup, as you've done:

<mat-select placeholder="Search for"
    [(ngModel)]="searchClassVal"
    panelClass="my-select-panel-class"
    (change)="onSearchClassSelect($event)">
    <mat-option *ngFor="let class of searchClasses" [value]="class.value">{{class.name}}</mat-option>
  </mat-select>

However, applying CSS styles to this custom panel class can sometimes prove problematic. Let's explore several possible solutions:

1. Using ::ng-deep:
   Utilize the ::ng-deep shadow-piercing descendant combinator to force the styles through the child component tree:

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

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2. Employing ViewEncapsulation:
   Set the encapsulation mode to ViewEncapsulation.None to break the view encapsulation and apply the styles directly from the component:

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

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3. Adding Styles to style.css:
   Force the styles using the !important keyword:

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

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4. Incorporating Inline Styles:
   Apply inline styles directly to the mat-option element:

   <code class="html"><mat-option style="width:2000px; background-color: red; font-size: 10px;" ...></code>

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These methods should allow you to successfully style the mat-select panel in Angular Material.

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