Steps:
1) Prepare smaller version of logo - I suggest that new logo image should have less than 300px of width (~290px)
2) You can also remove bottom part with text "Epyna...." on smartphone people do not have to see it I guess
3) upload new PNG image into main /image folder
4) Then use this code:
@media (max-width: 440px) {
#gkLogo.cssLogo {
background: transparent url("http://www.fioredomenica.com/images/logo_mobile.png") no-repeat scroll 0 0;
height: 130px;
width: 290px;}
}
So in all smartphones devices logo should be readable and fully visible.
p.s.
In shop there are soap or sweets ?