body
{
	font-family: Arial;
	font-size: 14px;
	margin: 0px;
	background:white;
	vertical-align:top;
}
@media all and (min-width:300px) and (max-width:450px) 
{
	body
	{
		background: white;
		vertical-align:top;
		/* visibility:hidden; ko dung, an phan body*/
	}
	.desktop
		{
			display:none;	
		}
	.tablet
		{
			display:none;	
		}
	.mobile
		{
			display:block;	
		}
}


@media all and (min-width:650px)
{
	body
	{
		background:white;
		vertical-align:top;
		visibility:visible;
		margin-top:5px;
		
	}
	.desktop
		{
			display:block;	
		}
	.tablet
		{
			display:none;	
		}
	.mobile
		{
			display:none;	
		}
}