title: How to use variable in [ngStyle] in angular?
body: <p>I want to change position depends on some events.
  For example at the begining space from top should be 100px, but after button click should be 0px</p>
  
  <pre><code>&lt;mat-list-item class="menu-item disabled " disableRipple (click)="toggleSubmenu($event)"&gt;
      &lt;h3 matLine class="menu-item-text"&gt;Orchestration&lt;/h3&gt;
    &lt;/mat-list-item&gt;
  </code></pre>
  
  <p>I want to code some similar to </p>
  
  <pre><code>&lt;mat-list-item class="menu-item disabled " disableRipple (click)="toggleSubmenu($event)" [ngStyle]={top: myVarilable+'px'}&gt;
      &lt;h3 matLine class="menu-item-text"&gt;Orchestration&lt;/h3&gt;
    &lt;/mat-list-item&gt;
  </code></pre>
  
  <p>but it doesnt work for me. Do you have some ideas to solve it?</p>