body {
	margin: 0;
	padding: 0;
	font-family: 'source-sans-pro', Helvetica, Arial, sans-serif;
	font-size: 14px;
  
}
.demo_wrapper {
	width: 100%;
	margin: 0 auto;
position: relative;  z-index: 0; 
height : 300px; 
}
@media only screen and (max-device-width: 800px), screen and (max-width: 800px) {
  .demo_wrapper {
    width: 100%; 
    height : auto;  
  }  
}
.demo_block {
	width: 100%;   
}