html
{
  overflow: scroll;
  height: 99%;
}
                         
body
{
  background: #000000;
  height: 99%;
  margin: 0;
  padding: 0;
  line-height: 150%;
  text-align: center;
}


/* === Containers === */



#first_container
{
  margin: 0 auto 0 auto; 
  display: table; 
  height: 100%;  
  position: relative; 
  overflow: hidden; 
  width: 800px;
}

#second_container
{
  position: absolute; 
  top: 40%;
  vertical-align: middle;
  width: 100%; 
}

#third_container
{
  position: relative; 
  top: -163px; 
  width: 800px;
}
#fourth_container
{
  position:relative;
  width: 800px;
  overflow: scroll;
}