Gap between columns

I have a div block which is the full width of the viewport with 3 columns, for some reason there is what looks like a 1px gap between the 2nd and 3rd column which disappears once I resize the browser. The columns contain images and the last one contains a video (set to 100% width within the column)

Is there any way to make sure this small gap doesn’t appear? I’ve tried changing the background of the columns but the gap seems to be outside of them

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