body {
	font-family: 'Tahoma',serif;
	margin: 0;
	position: relative;
}
html,body,#CaptivateContent { 
	height:100%; 
}
p {
	margin-left: 20px;
}
#CaptivateContent { 
	text-align:center;
}
#header {
	background-color: #5181D3;
	width: 100%;
	height: 44px;
	position: fixed;
	top: 0;
}
#body {
	margin: 54px 20px;
	color: #5181D3;
}
#footer {
	background-color: #F2F2F2;
	width: 100%;
	position: absolute;
	margin-bottom: 0;
}
#footer p {
	color:#5181D3;;
	text-align: center;
}
#lession {
	position: center;
}
#lession p{
	text-align: left;
	width: 600px;
	background-color: #5181D3;
	padding-top: 7px;
	padding-bottom: 7px;
	margin:1px;
	border-radius: 2px;
}
#parent {
	width: 910px;
}
#chucnang {
	margin: 40px;
	width: 800px;
	text-align: left;
}
#mua_ma {
	margin: 40px;
	width: 800px;
	text-align: left;
}
#cai_dat {
	margin: 40px;
	width: 800px;
	text-align: left;
}
#update {
	margin: 40px;
	width: 800px;
	text-align: left;
}
.headerButton {
	margin-left: 120px;
	color: white;
	text-decoration: none;
	transition: color 0.3s, background-color 0.3s;
	padding: 5px 15px;
	border-radius: 5px;
	border: 1px solid white;
}