.demo_wrapper {
	width: 100%;
	margin: 0 auto;  
}
.demo_block {
  
}

@media only screen and (max-device-width: 800px), screen and (max-width: 800px) {
  .demo_wrapper {
    width: 100%;	
  }  

.demo_block {
	width: 100%;
}
}