Angular Material mat-menu-item to be the same size as the mat-menu button

Question

I use mat-menu of Angular Material with different mat-menu-item and I would like the list of menu items to be the same size as the button.

That's what I have:

And what I wish:

I tried to change the size of the menu with the css, but it does not work properly.

CSS:

.cdk-overlay-pane {width: 100%;}
.mat-menu-panel {width: 100%;}

HTML:

<button mat-raised-button [matMenuTriggerFor]="menu" class="btn-block btn-blue">
  <div fxLayout="row" fxLayoutAlign="center center">
    <mat-icon>more_vert</mat-icon>
    <span fxFlex>OPTION</span>
  </div>
</button>

<mat-menu #menu="matMenu">
  <button mat-menu-item>
    <mat-icon>unarchive</mat-icon>
    <span>First</span>
  </button>
  <button mat-menu-item>
    <mat-icon>file_copy</mat-icon>
    <span>Second</span>
  </button>
</mat-menu>

I did a StackBlitz HERE for my mat-menu.

Thank you in advance!

EDIT : I changed my code because I'm using a responsive button with the bootstrap class "btn-block".

Answer 1

Use ::ng-deep to style .mat-menu-panel

::ng-deep .mat-menu-panel {
  padding: 0 10px!important;
  width: 100%!important;
}

See working code

Answer 2

I found a solution really not clean, but here it is: StackBlitz HERE

If someone would have a CSS solution, I'm interested.

HTML:

<button mat-raised-button [matMenuTriggerFor]="menu" class="btn-block btn-blue" id="button">
  <div fxLayout="row" fxLayoutAlign="center center">
    <mat-icon>more_vert</mat-icon>
    <span fxFlex>OPTION</span>
  </div>
</button>

TS:

export class AppComponent implements DoCheck{
  ngDoCheck(){
    var widthButton=document.getElementById("button").offsetWidth;

    var elems = document.getElementsByClassName('mat-menu-panel');
    for(var i = 0; i < elems.length; i++) {
      elems[i].style.width = widthButton+"px";
    }
  }
}

CSS:

.cdk-overlay-pane {width: 100%!important;}
.mat-menu-panel {max-width: 100%!important; min-width: 64px!important;}

DEMO: