How do I stack my images on my homepage on Mobile using CSS?

Site URL: https://cristinabevia.com/

Hello!

I'm having an issue with the mobile version of my site. The single banner images are two per row and very very small. I'm hoping to make each image one row without changing the look of my desktop version. 

For some context, this home page is an index page and the images link to these pages. 

I'm very new to CSS and have had a hard time seeing any changes when I write codes I've been finding. 

It looks like you solved with this CSS?

@media screen and (max-width: 700px) {
    #projectThumbs .project {
        float:;
        width: 100% !important;
        right: 3.3% !important
    }

    #projectThumbs .project img {
        width: 100% !important;
        height: auto !important;
        left: 0 !important;
        top: 0 !important
    }
}