html {
  height: 100%;
  margin: 0px;
  padding: 0px;
}

body {
  font-family: Helvetica, sans-serif;
  background-color: #222;
  color: #CCC;
  height: 100%;
  margin: 0px;
  padding: 0px;
}

a {
  color: #000;
}

.header_div {
  position: fixed;
  left: 0;
  top: 0;
  width: 100%;
  background-color: #444;
  padding: 0px;
  color: #FFF;
  box-shadow: -15px 5px 10px #000;
  z-index: 10;
}

.header_contents_div {
  width: 100%;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
  padding: 10px 0px;
}

.header_contents_div label {
  font-size: 150%;
  margin-right: 20px;
}

.nav_label {
	  color: #AAA;
	  font-size: 80%;
	  margin-right: 20px;
	  margin-left: 0px;
	  float: right;
}

.nav_label a {
	  font-size: 80%;
	  color: #AAA;
	  text-decoration: none;
}

#cloud_chamber {
  position: fixed;
  top: 0px;
  left: 0px;
  width: 100%;
  height: 100%;
  z-index: 1;
}

.container_div {
  width: 100%;
  min-height: 100%;
  margin: 0px;
  padding: 0px;
}

.main_div {
  position: relative;
  width: 100%;
  height: 100%;
  max-width: 800px;
  margin: 0px auto;
  color: #000;
  background-color: #FFF;
  padding: 80px 20px;
  z-index: 3;
}

.main_div img {
  display: block;
  margin: 20px auto;
}

.nav_div {
  float: right;
}

.video_frame, iframe, .centerdiv {
    display: block;
    margin: 0 auto;
    text-align: center;
}