Increase margin / padding to sides of images

Site URL: https://www.boutique14.co.uk

Hi,

How can I introduce some space to the sides of the three images on my homepage? See red squiggles on attached screenshot.

When I use spacer blocks the images resize and I can't get them all the same size again. I can't re-size the spacer blocks sufficiently to make it work (there's a minimum width).

Is there either some CSS to make spacer blocks more width adjustable or some other way I could put a margin or padding around those three images to bring them in a little?

Thanks. 

Add to Home > Design > Custom CSS

section#wedding-day-first-glimpse .Index-page-content {
    padding-left: 10vw;
    padding-right: 10vw;
}

Thank you again, Tuanphan!