Different Ratio on Different Page

To change ratio on a specific portfolio page, you can do these

#1. First, use below tool to find Portfolio Page ID

In my example, it is: #collection-65a0f094afedb608fc534671

#2. Next, use CSS code like this to Website Tools > Custom CSS

#collection-65a0f094afedb608fc534671 .grid-image {
    padding-bottom: 75% !important;
}

#3. Note
* 2:3 = 150%
* 3:2 = 66.667%
* 1:1 = 100%