How to customize the product image border frame in Dawn theme?

Store Design
3

Please add the below code in component-card.css

  1. Go to Online store → Theme → Action → Edit code
  2. Asset → component-card.css
.card.card--product.card--outline {
    border: 2px solid rgba(0, 0, 0, 0.3); /*change the color and width as required*/
}

Hope this will help you
Thanks