Hi,

If you want to do that, please add more this code to Customize > Custom CSS:

.featured-area .penci-owl-carousel .owl-dot{ margin: 0 4px; }
.featured-area .penci-owl-carousel .owl-dot span{ width: 16px; height: 16px; border-color: #4d57d6; }
.featured-area .penci-owl-carousel .owl-dot.active span{ background: #ff0000; border-color: #fff000; }

Change values 16 on the above code to the size as you want.

Change color codes:  4d57d6 and ff0000 and fff000 to color codes as you want. You can get a color code here

Best Regards,

PenciDesign