I have never had any difficulties changing size of icons. Now the main trouble is that change of -shell-grid-item-size does not take effect. I was sure that -shell-grid-item-size defined the size of container (an icon and its paddings). But whatever value I install noting changes.

.icon-grid {
    spacing: 25px;
    -shell-grid-item-size: 50px;

.all-app .overview-icon {  
    -shell-grid-item-size: 100px;

I tried the accepted solution from How to reduce the size of all gnome-shell icons? and didn't succeed.

The solution

I might have forgotten to restart GNOME. Alt + F2, type r, and press Enter


In case anyone errs here as I did in search of a clue to tune down (or up, as it also happens) the size of the icons in the applications grid, here is a hint:


As mentioned by Maksim, the changes in the gnome-shell.css file affect the size and padding of the container, but the size of the icons must be changed separately in the /usr/share/gnome-shell/js/ui/iconGrid.js file. Or at least this is what worked for me.

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