How to change background color of specific angular material tabs?

Question

I have a component using mat tab from angular material 7.

I want to change the background color of my tabs depending on a boolean value of my typescript variable.

Answer 1

You might not want to set encapsulation: ViewEncapsulation.None, this will make the styling for this component be applied to all other components too.

Instead you can set the color for the tab in your styles.scss like this:

.mat-tab-header{
    background-color: #424242;
}

Answer 2

Edited: If you want to change a single tab you can use the aria-label input parameter.

You'll have to add the

encapsulation: ViewEncapsulation.None

And use a specific css selectors like so:

HTML:

<mat-tab-group [color]="colorToggle.value" [backgroundColor]="backgroundColorToggle.value">
  <mat-tab label="First" [aria-label]=backgroundColorToggle.value> Content 1 </mat-tab>
  <mat-tab label="Second"> Content 2 </mat-tab>
  <mat-tab label="Third"> Content 3 </mat-tab>
</mat-tab-group>

CSS:

[aria-label=primary] {
  background-color: blue;
}

[aria-label=accent] {
  background-color: aqua;
}

You can find example here

If you want for all tabs:

You have a dedicated API for it.

Just use the backgroundColor property like so:

<mat-tab-group [color]="colorToggle.value" [backgroundColor]="backgroundColorToggle.value">

You can find the full example here