tab-size: 8 (初期値) #leftmenu {　　 position: absolute; top: 120px; left: 0; width: 170px; padding: 0 0 20px 10px; }

tab-size: 4 #leftmenu {　　 position: absolute; top: 120px; left: 0; width: 170px; padding: 0 0 20px 10px; }