How do I change the aspect ratio of product thumbnails?

Please follow this code: 

html .tagalys-namespace .tagalys-product-tile .product-link .product-image-container:before, html #tagalys-namespace .tagalys-product-tile .product-link .product-image-container:before {
  padding-bottom: 100%;
}
/* example padding-bottom values:
  100% - square
  133% - 3/4 (portrait)
  75% - 4/3 (landscape)
*/