<style type="text/css">
iframe.youtube-16-9 {
width: 100%;
height: auto;
aspect-ratio: 16 / 9;
}	
</style>&#13;&#10;<style type="text/css">
* {
 margin: 0px;
padding: 0px;
}
 
</style>&#13;&#10;<style type="text/css">
h1 span {
  display: inline-block;
}
h2 span {
	display: inline-block;
}
h3 span{
	display: inline-block;
}
</style>&#13;&#10;<style type="text/css">
p {
   text-align: justify; /* 両端揃え */
   text-justify: inter-ideograph; /* 両端揃えの種類 */
}
</style>