.window_boundingbox {
	position: fixed;
	border: 1px solid #000;
	width: 500px;
	height: 300px;
	left: 50%;
	top: 100px;
	boder-shadow: 0 0 12px rgba(0, 0, 0, 0.5);
  background: #fff;
}

.window_boundingbox .window_footer {
  position: absolute;
  bottom: 0;
  padding-bottom: 10px;
  text-align: center;
  width: 100%;
}

.window_boundingbox .window_cancel {
  margin-left: 20px;
}

.window_boundingbox .window_alert {
  width: 50px;
  position: absolute;
  bottom: 10px;
  left: 50%;
  margin-left: -25px;
}

.window_boundingbox .window_header {
  background: #333;
  color: #fff;
  text-align: center;
  padding: 5px;
  font-size: 20px;
}

.window_boundingbox .window_body {
  padding: 10px;
}

.window_boundingbox .window_close {
  position: absolute;
  right: 0;
  top: 0;
  padding: 5px 10px;
  font-size: 20px;
  background: #c00;
  color: #fff;
}

.window_mask {
  width: 100%;
  height: 100%;
  opacity: 0.4;
  position: fixed;
  left: 0;
  top: 0;
  background: #000;
}

/* skin for a */
.window_skin_a.window_boundingbox {
  box-shadow: none;
  border: 10px solid rgba(0, 0, 0, 0.3);
  border-radius: 8px;
}

.window_skin_a .window_alert {
  width: 50px;
  position: absolute;
  bottom: 10px;
  left: auto;
  right: 20px;
  margin-left: 0;
  background: red;
  border: none;
  color: #fff;
  padding: 10px;
}

.window_skin_a .window_header {
  background: red;
  text-align: left;
  padding: 10px;
  font-weight: bold;
}

.window_skin_a .window_close {
  width: 45px;
  height: 45px;
  border-radius: 45px;
  line-height: 45px;
  padding: 0;
  text-align: center;
  background: blue;
  font-size: 24px;
  font-weight: bold;
  right: -15px;
  top: -15px;
}