如何在角度6中设置激活的链接颜色

Question

我正在尝试将激活的链接颜色设置为6号红色。我该怎么做。

    ngOnInit() {
    this.items = [
        {label:'Home', routerLink:'/home'},
        {label:'Cycle', routerLink:'/cycle'},
        {label:'Football', routerLink:'/football'},
        {label:'Cat', routerLink:'/cat'} 
    ];
    }