html and css for smartphone

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HI

i cannot find the way to modify the appearance/margins of pictures but only on smartphone

to the page i provided : https://ordilivres.org/

look down the slider, you will see 4 icons
heart, computer, etc

on a smartphone you will see that they are 1 by 1

i want them to be 2 by 2 on two rows instead of 4 rows

i changed the margin in html but it has no incidence on smartphone

thanks : )