.spb-asset-content.size1{
max-width:30%!important;
}
This code doesn’t work because it has the incorrect structure.
In the html the spb-asset-content is inside the size1 object so it should be like this
.size1 .spb-asset-content{
max-width:30%!important;
}
also that object is already being targeted by this rule
.size1 {
max-width: 33%!important;
}
-Rui