Angular material tab

How can I modify angular tab is like that? I couldn't make the borders like this.I can do it normally but I couldn't do it for mat-tab. If there are more than 2, how can I do it to support the middle one?

<mat-tab-group>
<mat-tab label="tab 1">

</mat-tab>
<mat-tab label="tab 2">

</mat-tab>
</mat-tab-group>


Desired Output



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