BOOTSTRAP--CSS Component--drop-down menu (dropdown)

The

dropdown, Dropdown-menu, Dropdown-header, divider, dropdown-submenu
Examples are shown in the drop-down menu. HTML

//source code. Dropup,. dropdown {position:relative;}. dropdown-toggle:focus {outline:0;}. dropd
  Own-menu {position:absolute;
  top:100%;
  left:0;
  z-index:1000;
  Display:none;
  Float:left;
  min-width:160px;
  padding:5px 0;
  margin:2px 0 0;
  font-size:14px;
  Text-align:left;
  List-style:none;
  Background-color: #fff;
          -webkit-background-clip:padding-box;
  Background-clip:padding-box;
  border:1px solid #ccc;
  border:1px solid Rgba (0, 0, 0,. 15);
  border-radius:4px;
          -webkit-box-shadow:0 6px 12px rgba (0, 0, 0,. 175);
box-shadow:0 6px 12px rgba (0, 0, 0,. 175);
  }. dropdown-menu.pull-right {right:0;
Left:auto;
  }. Dropdown-menu. divider {height:1px;
  MARGIN:9PX 0;
  Overflow:hidden;
Background-color: #e5e5e5;
  }. dropdown-header {display:block;
  PADDING:3PX 20px;
  font-size:12px;
  line-height:1.42857143;
  Color: #777;
White-space:nowrap; }

<! DOCTYPE html>