Hallo Timo,
<select name="kompetenzen[]" style="width=300px" size="5">
... style="width:300px;" ...
<div id="content">
...
<select name="kompetenzen[]" size="5">
http://www.w3.org/TR/html401/types.html#type-cdata:
"ID and NAME tokens must begin with a letter ([A-Za-z]) and may be
followed by any number of letters, digits ([0-9]), hyphens ("-"),
underscores ("_"), colons (":"), and periods (".")."
<select name="kompetenzen" size="5">
#content.kompetenzen[]
{
width: 225px;
}
#content select[name="kompetenzen"] { width: 225px; }
oder
#content select { width: 225px; }
oder
select { width: 225px; }
...
Viele Grüße,
Stefan