html {
	font-size: 100%;
	height: 100%;
	width: 100%;
	overflow-x: hidden;
	margin: 0;
	padding: 0;
	touch-action: manipulation;
}

body {
	font-size: 16px;
	font-family: 'Open Sans', sans-serif;
	width: 100%;
	height: 100%;
	margin: 0;
	font-weight: 400;
}

.display-table {
	display: table;
	height: 100%;
	width: 100%;
}

.display-table-cell {
	display: table-cell;
	vertical-align: middle;
}

h1, h2, h3, h4, h5, h6, p, a, ul, span, li, img, button {
	margin: 0;
	padding: 0;
}

h1, h2, h3, h4, h5, h6 {
	line-height: 1.5;
	font-weight: inherit;
}

h1, h2, h3 {
	font-family: 'Poppins', sans-serif;
}

p {
	line-height: 1.6;
	font-size: 1.05em;
	font-weight: 400;
	color: #555;
}

h1 {
	font-size: 3.5em;
	line-height: 1;
}

h2 {
	font-size: 3em;
	line-height: 1.1;
}

h3 {
	font-size: 2.5em;
}

h4 {
	font-size: 1.5em;
}

h5 {
	font-size: 1.2em;
}

h6 {
	font-size: .9em;
	letter-spacing: 1px;
}

a, button {
	display: inline-block;
	text-decoration: none;
	color: inherit;
	transition: all .3s;
	line-height: 1;
}

a:focus, a:active, a:hover,
button:focus, button:active, button:hover,
a b.light-color:hover {
	text-decoration: none;
	color: #E45F74;
}

b {
	font-weight: 500;
}

img {
	width: 100%;
}

li {
	list-style: none;
	display: inline-block;
}

span {
	display: inline-block;
}

button {
	outline: 0;
	border: 0;
	background: none;
	cursor: pointer;
}

b.light-color {
	color: #444;
}

.center-text {
	text-align: center;
	display: table-cell;
	vertical-align: middle;
}

.font-white {
	color: #fff;
}

.main-area {
	box-shadow: 2px 5px 30px rgba(0,0,0,.3);
	color: #fff;
}
#bird {
	height: 100vh;
}


html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  width: 100%;
  overflow: hidden; /* スクロールバーを消す（余白防止） */
}

.main-area {
  width: 100%;
  height: 100vh; /* ビューポート全体を確保 */
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0;
  padding: 0;
}

#bird {
  width: 100%;
  height: 100%;
  margin: 0;
  padding: 0;
}