body {
	margin: 0;
	padding: 0;
	font-family: 'source-sans-pro', Helvetica, Arial, sans-serif;
	font-size: 14px;
}
.demo_wrapper {
	width: 100%;
	height:300px;
	margin: 0 auto;
}
@media only screen and (max-device-width: 800px), screen and (max-width: 800px) {
  .demo_wrapper {
    width: 80%;
  }  
}
.demo_block {
	width: 100%;
}