как растянуть на 80%?

<div class="sortn"><form name="news_set_sort" id="news_set_sort" method="post" action="">Сортировать статьи по:&nbsp;<a href="#" onclick="dle_change_sort('date','asc'); return false;">дате</a> | <a href="#" onclick="dle_change_sort('rating','desc'); return false;">популярности</a> | <a href="#" onclick="dle_change_sort('news_read','desc'); return false;">посещаемости</a> | <a href="#" onclick="dle_change_sort('comm_num','desc'); return false;">комментариям</a> | <a href="#" onclick="dle_change_sort('title','desc'); return false;">алфавиту</a><input type="hidden" name="dlenewssortby" id="dlenewssortby" value="date">
<input type="hidden" name="dledirection" id="dledirection" value="DESC">
<input type="hidden" name="set_new_sort" id="set_new_sort" value="dle_sort_main">
<input type="hidden" name="set_direction_sort" id="set_direction_sort" value="dle_direction_main">
</form></div>

#system .sortn .sortn {
line-height: 32px;
background-position: 130% -33px;
}
#system .sortn {
background: url(../images/sortnews.png) no-repeat;
height: 33px;