Hello,
Add the following code to Custom CSS or child theme style.css
@media only screen and (max-width:480px){
.open-filters-btn {
position: fixed;
right: 0;
top: 120px;
background-color: #fff;
z-index: 9;
padding: 5px;
}
.open-filters-btn a i {
left: 5px;
}
}
Regards