親フォルダ 
<!DOCTYPE html>
<html lang="ja">
<head>
<meta content="width=device-width initial-scale=1.0 minimum-scale=1.0 maximum-scale=1.0 user-scalable=no" name="viewport">
<meta charset="UTF-8">
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.1.1/css/bootstrap.css">
<title>タイトル</title>

<style>
#main {
	padding: 20px;
}

.left {
	display:inline-block;
	width: 80px;
	margin-bottom: 20px;
}

.right {
	display:inline-block;
}

</style>

<script>
</script>

</head>