body{
	margin-top:0px;/*上のマージンを消す*/
	background-color:gray;
	text-align:center;
	margin-bottom:0px;/*下のマージンを消す*/
}
.cont{
	text-align:left;
	width:640px;
	margin-left:auto;
	margin-right:auto;
	border-style:solid;
/*
	border-color:grey;
*/
	border-width:1px;
}
.main{
	background-color:white;
	padding-left:10px;
	padding-right:10px;
}