html,
body {
  font-family: Meiryo,"Hiragino Kaku Gothic Pro";
  min-height: 100%;
  height: 100%;
  margin: 5px;
  padding: 0;
  color: #fff;
}
body:before {
	content:"";
	display:block;
	position:fixed;
	top:0;
	left:0;
	z-index:-1;
	width:100%;
	height:100vh;
	background-size:cover;
	background-position: center center;
	background-repeat: no-repeat;
	min-height: 100vh;
	height: -webkit-fill-available;
	background-image: url("../images/bg.png");
}
header {
  overflow:hidden;
  width: 748px;
  margin: 0;
  padding: 0;
}
h1 {
  float: left;
  padding: 0;
  margin: 0;
}
h2 {
  clear: both;
}
h3 {
  margin: 40px 0;
  padding: 40px 0;
}
nav {
  float: right;
  text-align: center;
}
footer {
  width: 748px;
  margin: 40px 0;
  padding: 0;
}
form {
  width: 728px;
  margin: 0 auto;
}
#sentence {
  float: left;
  width: 610px;
  padding: 0;
  margin: 5px 5px 0 0;
  font-size: 24px;
}
button {
  float: left;
  width: 100px;
  padding: 0;
  margin: 5px;
  font-size: 24px;
}
input[type="submit"] {
  width: 200px;
}
select {
  margin: 10px 0 0 0;
}
#select {
  margin: 20px;
}
a {
  color: #fff;
  text-decoration: underline;
}
a:hover {
  color: #000;
  background-color: #fff;
  text-decoration: none;
}
nav a {
  float: left;
  margin: 0;
  padding: 10px;
  text-decoration: none;
  font-weight: bold;
}
#select_num {
  color: #000;
  background-color: #fff;
}
#container {
  width: 748px;
  height: 100%;
  min-height: 100%;
  z-index: 1;
}
ul {
  clear: both;
}
li {
  width: 700px;
  padding: 5px 0;
}
.koma {
  width: 748px;
  margin: 10px 0;
  background-color: #fff;
}
.talk {
  clear: both;
  color: #000;
  padding-top: 5px;
  font-size: 24px;
  background-color: #fff;
}
.fukidashi {
  width: 748px;
}
.rakugaki {
  width: 748px;
}
img {
  vertical-align: bottom;
}
#minsize {
  min-height: 50%;
}