Angular Material Expansion Panel not working with different component - html

Question

I am starting my journey with Angular Material and I'm stuck on one thing.
Expansion Panel is not working (I see this panel but I can't open/close it). I found out that it's not working because of "nav component" (created with material) which I am importing in this component (when I delete "nav component" expansion panel works).
And yes, I have used
import {MatExpansionModule} from '#angular/material/expansion';
This is component with Expansion Panel
<app-navigation-bar></app-navigation-bar>
<section id="faq">
<h2>FAQ</h2>
<mat-expansion-panel>
<mat-expansion-panel-header>
<mat-panel-title>
This is the expansion title
</mat-panel-title>
<mat-panel-description>
This is a summary of the content
</mat-panel-description>
</mat-expansion-panel-header>
<p>This is the primary content of the panel.</p>
</mat-expansion-panel>
</section>
And here is code of the "nav component"
<section id="navigation-bar">
<mat-drawer-container class="example-container">
<mat-drawer class="left-nav" mode="side" opened>
<button class="nav-button"><i class="far fa-play-circle"></i></button>
<button class="nav-button"><i class="fab fa-500px"></i></button>
<button class="nav-button"><i class="fas fa-broadcast-tower"></i></button>
<button class="nav-button"><i class="fas fa-film"></i></button>
<button class="nav-button"><i class="fas fa-microphone"></i></button>
<button [routerLink]="['/faq']" routerLinkActive="router-link-active" class="nav-button"><i class="fas fa-info"></i></button>
<button [routerLink]="['']" routerLinkActive="router-link-active" class="nav-button" id="exit"><i class="far fa-times-circle"></i></button>
</mat-drawer>
<mat-drawer-content class="right">
</mat-drawer-content>
</mat-drawer-container>
</section>
And here is pic of it

Answer 1

I figured it out. When you are making component just for an element on site, make sure it doesn't have width: 100%; it makes foil effect on the site (you can't click any button because all content is under this component).