.nav-sec{ width:65%; height:auto; margin:auto;}

.header-left-solution{ width:20%; display:block; height:500px; margin-right:3%; float:left;}
.header-overview{ width:100%; float:left; font-size:18px; font-weight:bold;color:#fff; height:55px;line-height:55px;border-bottom:1px solid #fff;}
.header-item-solution{ width:100%; float:left;}
.header-item-solution ul{ display:block;}
.header-item-solution ul li{ float:left; width:100%; height:45px;line-height:45px; font-size:15px; display:block; color:#fff;}

.header-right-solution { width:75%; float:left;}
.header-column{ width:100%; float:left;}
.header-column .header-item-block1{ float:left; width:19%; display:block; text-align:center; height:250px; margin-right:1%;}
.header-column .header-item-block1 H4{color:#fff; float:left;font-weight:bold;font-size:18px;text-align:center; width:100%;  height:55px;line-height:55px;border-bottom:1px solid #fff;}