body {
	margin: 0;
}
header {
	padding: 10px;
	text-align: center;
}
.iframe-content {
	position: relative;
	width: 900px;
	padding: 40% 0 0 0;
	margin: 0 auto;
}
@media screen and (max-width: 900px) {
	.iframe-content {
		width: auto;
	}
}
iframe {
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
	border: none;
	margin: 0 auto;
    overflow-y: hidden;
    -ms-overflow-style: none;    /* IE, Edge 対応 */
    scrollbar-width: none;       /* Firefox 対応 */
}
iframe::-webkit-scrollbar {  /* Chrome, Safari 対応 */
    display:hidden;
}