I have 3 primeng datepickers in my page. I want to change highlight background color for just one of them. How can I do?

If I change on theme-blue-grey.css, all of them are changed.

theme-blue-grey.css

     .p-datepicker table td.p-datepicker-today > span.p-highlight {
            color: #ffffff;
            background: #525252;  //I want to change this color
     }

html

 <p-calendar #calendar1 [(ngModel)]="dates" appendTo="body" [inline]="true" selectionMode="multiple"></p-calendar>