Change inputs to block elements

src/app/create-comment/create-comment.component.html

 <form>
-  <mat-form-field>
+  <mat-form-field class="input-block">
     <input matInput type="text" maxlength="24" placeholder="Choose a title">
   </mat-form-field>
-  <mat-form-field>
+  <mat-form-field class="input-block">
     <textarea matInput placeholder="Add your comment"></textarea>
   </mat-form-field>