:root {
	--background: #aaffaa;
}

html {
	overflow-y: scroll;
}

body {
	margin: 20px;
	padding: 10px;
	text-align: center;
	font-size: 0.9em;
	background: #FFDEAD;
	font-family: 'Lucida Grande',
		'Hiragino Kaku Gothic ProN', 'ヒラギノ角ゴ ProN W3',
		Meiryo, メイリオ, sans-serif;

}

#page {
	margin-left: auto;
	margin-right: auto;
	margin-top: 0px;
	margin-bottom: 0px;
	padding: 0px;
	width: 900px;
	background: #ffffff;
	text-align: left;
	line-height: 140%;
	box-shadow: 2px 2px 10px #000;
}

#main {
	/* top, right, bottom, left */
	padding: 0px 20px 0px 20px;
	line-height: 140%;
}

#title {
	/* top and bottom, left and right */
	padding: 17px 0;
	text-align: center;

	background-image: url(sample.jpg);
	background-position: center;
	background-repeat: no-repeat;
	position: relative;
	background-size: cover;
	display: flex;
	flex-flow: column;
}

#title::before {
	/* https://qiita.com/7note/items/927f8f87ea0a0b580456 */
	display: block;
	background: linear-gradient(rgba(255, 255, 255, 0) 0, #fff 80%);
	/* background: radial-gradient(rgba(255, 255, 255, 0) 0, #fff 80%); */
	/* setting to overlap */
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
}

#title::after {
	/* https://developer.mozilla.org/docs/Web/CSS/backdrop-filter */
	-webkit-backdrop-filter: blur(5px);
	backdrop-filter: blur(5px);
	/* setting to overlap */
	content: "";
	position: absolute;
	top: 0;
	left: 0;
	width: 100%;
	height: 100%;
}

#title>* {
	z-index: 100;
}

#subject {
	font-weight: normal;
	margin: 0px;
	line-height: 130%;
	font-size: 30px;
	/* top and bottom, left and right */
	padding: 10px 0px;
	color: #333;
	text-shadow: 1px 1px 0px #fff, -1px -1px 1px #666;
}

#date {
	/* https://stackoverflow.com/a/48641561 */
	width: 50%;
	margin: auto;
	text-align: left;
	font-size: 17px;
	text-shadow: -1px -1px #ffffff, 1px -1px #ffffff, -1px 1px #ffffff, 1px 1px #ffffff;
}

#header {
	font-size: 20px;
	margin-left: auto;
	margin-right: auto;
	margin-top: 0px;
	margin-bottom: 0px;
	padding: 10px 20px 10px 20px;
	background: #333;
	color: #fff;
	text-align: center;
}

#footer {
	margin-left: auto;
	margin-right: auto;
	margin-top: 0px;
	margin-bottom: 0px;
	/* top, right, bottom, left */
	padding: 10px 20px 10px 20px;

	background: #333;
	color: #fff;
	text-align: right;
}

h1 {
	margin-top: 0px;
	font-weight: normal;
	font-size: 20px;
	padding: 10px;
	text-align: center;
	color: #ffffff;
	background: #333;
}

h2 {
	font-weight: normal;
	margin: 0px;
	line-height: 130%;
	font-size: 30px;
	/* top and bottom, left and right */
	padding: 10px 0px;
	color: #333;
	text-align: center;
	text-shadow:
		1px 1px 0px #fff,
		-1px -1px 1px #666;
}

h3 {
	margin-left: auto;
	margin-right: auto;
	font-weight: normal;
	background-color: #eee8aa;
	/* top and bottom, left and right */
	padding: 5px 0px;
	width: 700px;
	text-align: center;
	color: #006400;
	font-size: 17px;
	/* box-shadow: 10px 10px 10px rgba(0,0,0,0.4); */
	box-shadow: 10px 10px 10px rgba(0, 0, 0, 0.5);

}

h4 {
	width: 500px;
	font-weight: normal;
	background-color: var(--background);
	font-size: 14px;
	margin: 10px 0px;
	/* top and bottom, left and right */
	padding: 5px 20px;
	border: 1px solid #DDD;
	border-radius: 5px;
}

a:hover {
	color: #000000;
	background-color: #cccccc;
}

table {
	border-collapse: collapse;
	font-size: 100%;
}

td {
	border: none;
	text-align: left;
	padding: 7px;
}

.address::after {
	content: "@googlegroups.com";
}