use ngclass and ngif angular code example
Example 1: Angular 8 ngClass If
[ngClass]="{'my-class': step=='step1'}"Example 2: ngclass condition
[ngClass]="(step=='step1')?'my-class1':'my-class2'"[ngClass]="{'my-class': step=='step1'}"[ngClass]="(step=='step1')?'my-class1':'my-class2'"