Why doesn't center image alignment work on mobile. devices?

Question

css

Hello. Not strong in layout.
On the main page of the site there is a section under the slider.

I can't figure out why this section doesn't have image center alignment on mobile devices?

What is strange, if you turn on the mobile mode in firefox ctrl_shft + m, then everything works fine.
Cleaned cache. Site on gomnobitrix.
All the best, I'm dough)

Answer 1

.icon-box-3{
    text-align:center;
}
.icon-box-3 img{
    display:inline-block;
}

Answer 2

display: block;
margin: 0 auto;

for image