html {
	height: 100%;
}
body {
	margin: 0px;
	height: 100%;
}
#main {
	width: 100%;
	margin-right: auto;
	margin-left: auto;
	margin-top: 10px;
}
#main #text {
	width: 90%;
	margin-right: auto;
	margin-left: auto;
	margin-top: 40px;
}
#ans {
	width: 90%;
	margin-right: auto;
	margin-left: auto;
	margin-top: 30px;
}
#main #ans .text {
	margin: 10px;
}