.main_visual					{width:100%; border-bottom:1px solid #ccc;}
.main_banner_bg					{width:100%; background:#f5f4f3; border-bottom:1px solid #eee;}
.main_banner					{width:1000px; margin:0 auto; background:#f5f4f3; text-align:right;}

.main_center					{width:1000px; margin:30px auto; }
.main_center:after				{clear:both; display:block; content:''; width:100%;}
.main_center h2					{font-size:20px; color:#000; padding-bottom:10px; border-bottom:4px double #ddd;}
.main_center h2 a				{color:#000; text-decoration:none;}
.board_1						{width:260px; height:238px; padding:20px 30px; border:1px solid #ddd; float:left; position:relative;}
.board_2						{width:260px; height:238px; padding:20px 30px; border:1px solid #ddd; float:left; margin-left:20px; position:relative;}
.board_3						{width:260px; height:238px; padding:20px 30px; border:1px solid #ddd; float:right; position:relative;}