Styling Mat-Select in Angular Material

Styling mat-select in Angular Material

For Angular9+, according to this, you can use:

.mat-select-panel {
    background: red;
    ....
}

Demo

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Angular Material uses mat-select-content as class name for the select list content. For its styling I would suggest four options.

1. Use ::ng-deep:

Use the /deep/ shadow-piercing descendant combinator to force a style
down through the child component tree into all the child component
views. The /deep/ combinator works to any depth of nested components,
and it applies to both the view children and content children of the
component.
Use /deep/, >>> and ::ng-deep only with emulated view encapsulation.
Emulated is the default and most commonly used view encapsulation. For
more information, see the Controlling view encapsulation section. The
shadow-piercing descendant combinator is deprecated and support is
being removed from major browsers and tools. As such we plan to drop
support in Angular (for all 3 of /deep/, >>> and ::ng-deep). Until
then ::ng-deep should be preferred for a broader compatibility with
the tools.

CSS:

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

DEMO

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2. Use ViewEncapsulation

... component CSS styles are encapsulated into the component's view and
don't affect the rest of the application.
To control how this encapsulation happens on a per component basis,
you can set the view encapsulation mode in the component metadata.
Choose from the following modes:
....
None means that Angular does no view encapsulation. Angular adds the
CSS to the global styles. The scoping rules, isolations, and
protections discussed earlier don't apply. This is essentially the
same as pasting the component's styles into the HTML.

None value is what you will need to break the encapsulation and set material style from your component.
So can set on the component's selector:

Typscript:

  import {ViewEncapsulation } from '@angular/core';
  ....
  @Component({
        ....
        encapsulation: ViewEncapsulation.None
 })  

CSS

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

DEMO

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3. Set class style in style.css

This time you have to 'force' styles with !important too.

style.css

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

DEMO

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4. Use inline style

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

DEMO

Styling mat-option with Active and Hover - Angular Materials

mat-list-option has mat-option.mat-active class when it's active and mat-option.mat-selected when selected.

Please add the following CSS to your stylesheet:

.mat-option.mat-active {
  background: red !important;
}

The following could be used to style hovering:

.mat-option:hover:not(.mat-option-disabled)

Styling mat-select when on hover - Angular Material

All CSS changes either you need to make them in the "root" css or use ng-deep like

::ng-deep{
     .mat-option-text:hover:not(.mat-option-disabled) {
      background: #3071a9 !important;
      color: white;
    }

 .mat-option:hover {
      background: red !important;
      color: green !important;
    }
}

Since here you are changing a standard control my recommendation is make this change in your styles.css or based css.

update
Please node you I think what you want to modify is the mat-option-text:hover

Online Demo

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