Thanks for the info, check this one.
From you Admin page, go to Online Store > Themes
Select the theme you want to edit
Under the Asset folder, open the main.css(base.css, style.css or theme.css)
Then place the code below at the very bottom of the file.
@media only screen and (max-width: 989px){
.multicolumn-card__image-wrapper--third-width {
width: 50%;
}
}
@media only screen and (max-width: 749px){
.multicolumn-card__image-wrapper--third-width {
width: 70%;
}
}
And save.
Result:
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