JavaScript Angular-7 active link on tab is not working? angular active link color,angular active link css,angular active

I have 4 icons on which i'm trying for active link like this -like yellow active tab but it's not working don't know why i guess i'm missing some steps also when i'm changing router i need to highlight that router tab. Here is my .Html file for one module -( i only made changes in .html not .ts file)

 <div class="smart-manage">
 <a routerLink="/dashboard" class = "active" routerLinkActive = "active"[routerLinkActiveOptions]="{exact: true}" >
              <span data-toggle="tooltip" title="Smart Dashboard" data-placement="right">
               <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0
                                20 20" width="20" height="20"> 
Answer:1

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