.visible{
  visibility: visible;
}
.hidden{
  visibility: hidden;
}
.input_datas{
	font-size: 1.1em;
	width: 80%;
	margin-left: 10%;
	margin-right: 10%;
}
.login_id{
	width: 70%; 
	min-width: 200px; 
	font-size: 100%;
}
.password{
	width: 70%; 
	min-width: 200px; 
	font-size: 100%;
}