Four images in two columns side by side mobile view

Site URL: https://ukulele-pug-le4k.squarespace.com/shop-rein

I know this question has been asked many times and I have found a few good answers, but no solution to my current problem.

I'm trying to place four images within two columns in mobile view, and I used the following code to do it:

@media only screen and (max-width: 767px) {
  section[data-section-id="625c27d3f7aef559cbb62a98"]
    .sqs-layout
    .span-12
    .span-3 {
    width: 50% !important;
    float: left !important;
  }
}

I want the fourth image to be next to the third, and I'm having trouble finding the right code. 

Here is a screenshot of what it looks like now:

I hope someone can help me 🙂

It looks like your code made section 50% width only.

It looks like not possible to solve this. You can consider using Gallery Block to add Images, then we will give the code to make them side by side on mobile