change some css

src/frontend/app/list/filters/filters-tool.component.html

@@ -36,7 +36,7 @@
             </mat-option>
         </mat-select>
     </mat-form-field>
-    <button [disabled]="this.listProperties.order == ''" mat-icon-button [title]="this.listProperties.orderDir == 'DESC' ? lang.descOrder : lang.ascOrder"
+    <button [disabled]="this.listProperties.order == ''" [style.opacity]="this.listProperties.order == '' ? '0.2' : '1'" mat-icon-button [title]="this.listProperties.orderDir == 'DESC' ? lang.descOrder : lang.ascOrder"
         style="color: rgba(0,0,0,0.38);" (click)="changeOrderDir();">
         <mat-icon *ngIf="this.listProperties.orderDir == 'DESC'" fontSet="fas" fontIcon="fa-sort-amount-down fa-2x"></mat-icon>
         <mat-icon *ngIf="this.listProperties.orderDir == 'ASC'" fontSet="fas" fontIcon="fa-sort-amount-up fa-2x"></mat-icon>

src/frontend/app/list/filters/filters-tool.component.scss

@@ -8,6 +8,7 @@
     .mat-button-toggle-checked {
         background-color: #F99830;
         color: white;
+        border-radius: 10px;
     }
 }