Inside the app you go to the settings page of the reviews and press Custom CSS or go to the following link https://app.a2rev.com/#/settings/reviews?drawer=custom-css
a2-reviews-total[total]:not([total=""]) .a2-reviews-widget-total .vertical-align-middle {
background: url(https://static.a2rev.com/images/verify.svg) no-repeat left center;
padding-left: 22px;
}
Copy and paste the above CSS code into the box
Click “Save Change”