html {
    scroll-behavior: smooth;
}
body {
	counter-reset: number 0;
}
.logo{
	width:500px;
	display:block;
	margin:0 auto 20px;
}
h2{
	text-align: center;
	margin:100px 0 20px;
	font-size: 2em;
}
video{
	width:700px;
	display:block;
	margin:0 auto;
	border:1px solid #000;
}
p{
	width:980px;
	display:block;
	margin:0 auto;
}
.single{
	text-align: center;
	margin:50px auto 100px;
	line-height: 2em;
}
.single2{
	text-align: center;
	margin:0 auto 50px;
}
dl{
	margin-bottom:100px;
}
dt{
	text-align: center;
	font-weight: bold;
	margin-bottom:10px;
}
dl.functions dt{
	font-size: 3em;
}
dl.settings dt{
	font-size: 1.8em;
}
dl.settings dt:before{

	counter-increment: number 1;      /* number 増加数を1に設定 */
	content: counter(number)". ";      /* 表示形式 */
}
dd{
	text-align: center;
	line-height: 2em;
	margin:0 0 80px auto;
}
.block{
	width:500px;
	display: block;
	margin:20px auto;
}
ol{
	text-align: center;
}
ol li{
	list-style: decimal;
	list-style-position: inside;
}
a{
	text-decoration:underline;
}