On phone I see search icon overlaps menu icon and in MyCart I don't see Checkout button. Attached desktop screenshot which shows the phone problem.
Thanks

Dear paolo.alberti

I can't access to your ftp account. please go to \templates\sj_tini\layouts\left-main-right.xml and find:

col-md-4 col-sm-9 col-xs-9

=> change to:

col-md-4 col-sm-9 col-xs-8

and find:

col-md-6 col-sm-1 col-xs-1

=> change to:

col-md-6 col-sm-1 col-xs-2

=> result: prntscr.com/ehp4va

- about checkout button:
please send us the ftp account again to check directly, your account do not work.

Thanks

Sorry for FTP account. Please try again with same account.
Best regards.

Dear paolo.alberti

we're sorry late. please check ftp account again

Thanks

Sorry but the filter is automatically activated. Now I removed the filter. Please try again.
Thanks.

Dear paolo.alberti

Pleas go to the file /templates/sj_tini/css/responsive.css and find:
#bd table tbody tr {
display: inline-block;
vertical-align: top;
border-right: 1px solid #ccc;
margin-left: -4px;
}
=> Edit to:

#bd table tbody tr {
display: inline-block;
vertical-align: top;
border-right: 1px solid #ccc;
margin-left: -4px;
}
#bd table#cart_actions tbody tr {display: block;}

Thanks