How to resize section background image on mobile to match desktop

Hello, I recently uploaded photos to my website and I am wondering if there is a code to match the same width and size of the images that are displayed on desktop to mobile... When on mobile the photo cuts 90 percent of image and I want to same image on desktop to fit on mobile. I used this code : 

@media screen and (max-width: 767px) {
    section[data-section-id="636c8dd9fd83d57fec38aff2"] {
        min-height:30vh !important
    }
}

and nothing changed... I also tried various methods from videos and other forums and nothing is working.... any help or ideas ?

There's a total of 6 images that need to be adjusted....

Hi,

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