Lowering size of blog thumbnail - Warehouse

Hello,

A few days ago I created a post asking for tips on how to lower the thumbnail size of the website blog posts for my website thats running a Warehouse theme. The code that was posted is:

.blog-container .article-item .aspect-ratio {
padding-bottom: 100% !important;
}

This did resolve the issue of thumbnail size for an existing blog post, but when posting a new blog the thumbnail is still the same large size - editing the size of the picture makes no change. Is there something I can add to this code so that it applies to all blog post thumbnails?

Thanks very much.