1div.dokuwiki div.pubchem_imgbox{
2  padding-bottom:18px;
3  background:url('img/pubchem_icon.png') no-repeat;
4  background-position:bottom left;
5}
6div.dokuwiki a.pubchem_link{
7  display:block;
8  background:url('img/pubchem_icon.png') no-repeat 0 0;
9  overflow:hidden;
10  width:70px;
11  height:0;
12  padding-top:18px;
13}
14