Thank you danieliser.
I’ve just solved it with this hack that works at least on opera 12.10…
First of all I’ve made a class for the div that contains those “optionals”:
.optionals {
-webkit-column-count: 3 !important;
-moz-column-count: 3 !important;
column-count: 3;
-moz-column-width: 285px !important;
-o-column-count: 1 !important;
}
And then I’ve added an hack to target Opera (…and only Opera) with the non-exsisting pseudoclass “doesnotexist:-o-prefocus”
doesnotexist:-o-prefocus, .optionals {column-count:auto !important;}
And this just did the trick…
I hope it could be helpful.
Thanks for your help.