Three of those icons aren’t from Obsidian, but this is doable with the vanilla icons. The others should play along(?). Obviously, you want to go smaller, but with ridiculous size and color for impact. 
.is-mobile .view-header .view-action {
--icon-size: 50px; /* default - 24px */
color: var(--color-red);
}
If you have an iPad/tablet as well you may what to use the .is-phone selector instead of .is-mobile.