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About the <head>

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CSS

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HTML 

              
                <body id="background">
	<div>
		<div class="card">
			<div id="header">
				<input type="text" id="header-title" value="The Metamorphosis"
					style="font-weight: bold;color: #ffffff;">
			</div>
			<div id="content0">
				<textarea id="content0-title"
					rows="4">One morning, when Gregor Samsa woke from troubled dreams, he found himself transformed in his bed into a horrible vermin. He lay on his armour-like back, and if he lifted his head a little he could see his brown belly, slightly domed and divided by arches into stiff sections.</textarea>
			</div>
			<div id="content1" style="flex-direction: column;">
				<div>
					Target:
					<label><input onchange="onTarget(this)" type="radio" name="target" id="target-background"
							checked="checked">background</label>
					<label><input onchange="onTarget(this)" type="radio" name="target" id="target-header">header</label>
					<label><input onchange="onTarget(this)" type="radio" name="target"
							id="target-content0">content0</label>
					<label><input onchange="onTarget(this)" type="radio" name="target"
							id="target-content1">content1</label>
					<label><input onchange="onTarget(this)" type="radio" name="target" id="target-footer">footer</label>
				</div>
				<div id="setprop" style="align-items: center;">
					<div>
						BG Color:
						<input id="background-color" type="color" onchange="onChange(this)">
					</div>
					<div>
						BG Pattern:
						<select id="background-image" onchange="onChange(this)">
							<option value="none">none</option>
							<option value="pattern_a">A</option>
							<option value="pattern_b">B</option>
							<option value="pattern_c">C</option>
							<option value="pattern_d">D</option>
							<option value="stripe_1">stripe -</option>
							<option value="stripe_2">stripe |</option>
							<option value="stripe_3">stripe \</option>
							<option value="stripe_4">stripe /</option>
						</select>
					</div>
					<div>
						Text Color:
						<input id="color" type="color" onchange="onChange(this)">
					</div>
					<div>
						Size(rem):
						<input id="font-size" type="number" onchange="onChange(this)" step="0.1" style="width:45px;">
					</div>
					<div>
						Bold:
						<input id="font-weight" type="checkbox" onchange="onChange(this)">
					</div>
				</div>
				<pre id="content1-title"></pre>
				<button onclick="onDown()">BG Pattern Download</button>
			</div>
			<div id="footer">
				<input type="text" id="footer-title" value="Franz Kafka 1915">
			</div>
		</div>
		The bedding was hardly able to cover it and seemed ready to slide off any moment.
	</div>
</body>

</html>
!

CSS 

              
                body {
		background-color: #000000;
	}

	pre {
		white-space: pre-wrap;
		word-break: break-all;
	}

	.card {
		margin: 20px;
		filter: drop-shadow(0px 0px 2px #222222);
	}

	.card>div {
		display: flex;
		align-items: center;
		padding: 5px 5px 5px 10px;
	}

	.card>div:nth-child(1) {
		flex: 1;
	}

	.card>div:nth-child(1)>input,
	.card>div:nth-last-child(1)>input {
		background-color: rgba(0, 0, 0, 0);
		border: none;
		width: 100%;
	}

	.card>div:nth-child(2)>textarea,
	.card>div:nth-child(3)>textarea {
		background-color: rgba(0, 0, 0, 0);
		border: none;
		width: 100%;
		border-radius: 3px;
		vertical-align: top;
		font-family: 'ヒラギノ角ゴ Pro W3', 'Hiragino Kaku Gothic Pro', 'メイリオ', Meiryo, 'ＭＳ Ｐゴシック', sans-serif;
	}

	.card>div:nth-child(1) {
		border-radius: 5px 5px 0px 0px;
	}

	.card>div:nth-last-child(1) {
		border-radius: 0px 0px 5px 5px;
	}

	#footer-title {
		text-align: right;
		padding: 0px 10px 0px 0px;
	}

	#setprop {
		display: flex;
	}

	#setprop>div {
		margin-right: 10px;
	}
!

JS 

              
                var target = 'background';
		var cssobj = {
			'background': {
				'background-color': '#333333',
				'background-image': 'pattern_d',
				'color': '#999999',
				'font-size': '0.9rem',
				'font-weight': 'normal'
			},
			'header': {
				'background-color': '#222222',
				'background-image': 'pattern_c',
				'color': '#FFFFFF',
				'font-size': '1rem',
				'font-weight': 'bold'
			},
			'content0': {
				'background-color': '#EEEEEE',
				'background-image': 'none',
				'color': '#000000',
				'font-size': '0.9rem',
				'font-weight': 'normal'
			},
			'content1': {
				'background-color': '#444444',
				'background-image': 'pattern_a',
				'color': '#EEEEEE',
				'font-size': '0.8rem',
				'font-weight': 'normal'
			},
			'footer': {
				'background-color': '#777777',
				'background-image': 'stripe_4',
				'color': '#333333',
				'font-size': '0.8rem',
				'font-weight': 'normal'
			}
		};

		function initCSS() {
			var keys = Object.keys(cssobj);
			keys.map((key, index) => {
				setProp(key, 'background-color', cssobj[key]['background-color']);
				setProp(key, 'background-image', cssobj[key]['background-image']);
				setProp(key, 'color', cssobj[key]['color']);
				setProp(key, 'font-size', cssobj[key]['font-size']);
				setProp(key, 'font-weight', cssobj[key]['font-weight']);
			});
			setTarget();
		};

		function onDown() {
			var patternName = cssobj[target]['background-image'];
			if (patternName == 'none') {
				return;
			}
			// https://ja.javascript.info/blob
			let link = document.createElement('a');
			link.download = patternName + '.png';
			link.href = getPatternData(patternName);
			link.click();
			URL.revokeObjectURL(link.href);
		}

		function onTarget(self) {
			target = self.id.substr('target-'.length);
			setTarget();
			setCSS();
		}

		function setTarget() {
			var style = document.getElementById(target).style;
			document.getElementById('background-color').value = rgb2hex(style.backgroundColor);
			document.getElementById('background-image').value = cssobj[target]['background-image'];
			document.getElementById('color').value = rgb2hex(style.color);
			document.getElementById('font-size').value = style['font-size'].replace(/[^0-9.]/g, '');
			document.getElementById('font-weight').checked = style['font-weight'] == 'bold';
		}

		function setCSS() {
			var html = '';
			html += '#' + target + ' {<br>';
			Object.keys(cssobj[target]).forEach((key) => {
				if (key == 'background-image' && cssobj[target][key] != 'none') {
					var data = getPatternData(cssobj[target][key]);
					html += '    ' + key + ': url("' + data + '");<br>';
				} else {
					html += '    ' + key + ': ' + cssobj[target][key] + ';<br>';
				}
			});
			html += '}';
			document.getElementById('content1-title').innerHTML = html;
		}

		function rgb2hex(rgb) {
			var list = rgb.replace(/[^0-9,]/g, '').split(',');
			let hex = 0;
			list.forEach((n, index) => {
				hex += parseInt(n) * Math.pow(256, 2 - index);
			})
			var str = '000000' + hex.toString(16).toUpperCase();
			return '#' + str.substr(str.length - 6);
		}

		function onChange(self) {
			var declaration = self.id;
			if (declaration == 'background-color') {
				cssobj[target][declaration] = self.value;
				setProp(target, declaration, self.value);
			} else if (declaration == 'background-image') {
				cssobj[target][declaration] = self.value;
				setProp(target, declaration, cssobj[target][declaration]);
			} else if (declaration == 'color') {
				cssobj[target][declaration] = self.value;
				setProp(target, declaration, self.value);
			} else if (declaration == 'font-size') {
				cssobj[target][declaration] = self.value + 'rem';
				setProp(target, declaration, self.value + 'rem');
			} else if (declaration == 'font-weight') {
				cssobj[target][declaration] = self.checked ? 'bold' : 'normal';
				setProp(target, declaration, self.checked ? 'bold' : 'normal');
			}
		}

		function setProp(target, declaration, value) {
			if (declaration == 'background-color') {
				document.getElementById(target).style.backgroundColor = value;
			} else if (declaration == 'background-image') {
				if (value == 'none') {
					document.getElementById(target).style.backgroundImage = 'none';
				} else {
					var data = getPatternData(value);
					document.getElementById(target).style.backgroundImage = 'url("' + data + '")';
				}
			} else if (declaration == 'color') {
				document.getElementById(target).style.color = value;
				if (document.getElementById(target + '-title')) {
					document.getElementById(target + '-title').style.color = value;
				}
			} else if (declaration == 'font-size') {
				document.getElementById(target).style['font-size'] = value;
				if (document.getElementById(target + '-title')) {
					document.getElementById(target + '-title').style['font-size'] = value;
				}
			} else if (declaration == 'font-weight') {
				document.getElementById(target).style['font-weight'] = value;
				if (document.getElementById(target + '-title')) {
					document.getElementById(target + '-title').style['font-weight'] = value;
				}
			}
			setCSS();
		}

		function getPatternData(name) {
			return pngHeader + this[name];
		}
		var pngHeader = "data:image/png;base64,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";

		var pattern_a = "kREMzAxNUUxMTM2ODExRUI5NzFBQzFENzAwN0U2Rjg3IiB4bXBNTTpEb2N1bWVudElEPSJ4bXAuZGlkOkREMzAxNUUyMTM2ODExRUI5NzFBQzFENzAwN0U2Rjg3Ij4gPHhtcE1NOkRlcml2ZWRGcm9tIHN0UmVmOmluc3RhbmNlSUQ9InhtcC5paWQ6REQzMDE1REYxMzY4MTFFQjk3MUFDMUQ3MDA3RTZGODciIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6REQzMDE1RTAxMzY4MTFFQjk3MUFDMUQ3MDA3RTZGODciLz4gPC9yZGY6RGVzY3JpcHRpb24+IDwvcmRmOlJERj4gPC94OnhtcG1ldGE+IDw/eHBhY2tldCBlbmQ9InIiPz6Fr7uhAAAAI0lEQVR42mL4//+/FBAzwDATIyMjAwhjAJhKJpgATBVAgAEAW5ASMKGRjY0AAAAASUVORK5CYII=";

		var pattern_b = "jMwQUExREQ4MTM2OTExRUI5Njg3RkZDRDUyMThGOTlEIiB4bXBNTTpEb2N1bWVudElEPSJ4bXAuZGlkOjMwQUExREQ5MTM2OTExRUI5Njg3RkZDRDUyMThGOTlEIj4gPHhtcE1NOkRlcml2ZWRGcm9tIHN0UmVmOmluc3RhbmNlSUQ9InhtcC5paWQ6MzBBQTFERDYxMzY5MTFFQjk2ODdGRkNENTIxOEY5OUQiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6MzBBQTFERDcxMzY5MTFFQjk2ODdGRkNENTIxOEY5OUQiLz4gPC9yZGY6RGVzY3JpcHRpb24+IDwvcmRmOlJERj4gPC94OnhtcG1ldGE+IDw/eHBhY2tldCBlbmQ9InIiPz575j4tAAAAJklEQVR42mL4//+/FBAzAIEUiGAAcZAFmUAkIyMjXBIsiqwKIMAAo2kbh0L1vkMAAAAASUVORK5CYII=";

		var pattern_c = "jE3NDQ4NkE3MTM2QjExRUJCM0QzQzE3ODJDQTZBRjgxIiB4bXBNTTpEb2N1bWVudElEPSJ4bXAuZGlkOjE3NDQ4NkE4MTM2QjExRUJCM0QzQzE3ODJDQTZBRjgxIj4gPHhtcE1NOkRlcml2ZWRGcm9tIHN0UmVmOmluc3RhbmNlSUQ9InhtcC5paWQ6MTc0NDg2QTUxMzZCMTFFQkIzRDNDMTc4MkNBNkFGODEiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6MTc0NDg2QTYxMzZCMTFFQkIzRDNDMTc4MkNBNkFGODEiLz4gPC9yZGY6RGVzY3JpcHRpb24+IDwvcmRmOlJERj4gPC94OnhtcG1ldGE+IDw/eHBhY2tldCBlbmQ9InIiPz4BtKsrAAAAL0lEQVR42jSIsQEAMAjCgjf4/4X+YMW2DIQgILt7QHmLmz0lEbYvZkzlkzKPAAMATMUUKZmCkdMAAAAASUVORK5CYII=";

		var pattern_d = "jgxOUMwMENCMTMzODExRUJBQ0Y1ODEyMThBODUxQzVBIiB4bXBNTTpEb2N1bWVudElEPSJ4bXAuZGlkOjgxOUMwMENDMTMzODExRUJBQ0Y1ODEyMThBODUxQzVBIj4gPHhtcE1NOkRlcml2ZWRGcm9tIHN0UmVmOmluc3RhbmNlSUQ9InhtcC5paWQ6ODE5QzAwQzkxMzM4MTFFQkFDRjU4MTIxOEE4NTFDNUEiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6ODE5QzAwQ0ExMzM4MTFFQkFDRjU4MTIxOEE4NTFDNUEiLz4gPC9yZGY6RGVzY3JpcHRpb24+IDwvcmRmOlJERj4gPC94OnhtcG1ldGE+IDw/eHBhY2tldCBlbmQ9InIiPz4x6NanAAAAJElEQVR42mL4//8/AxDwggggmxfOAdFQSQZUFSACJAOjAQIMAIoXGFFmFVCnAAAAAElFTkSuQmCC";

		var stripe_1 = "jAxRDMwQzQwMTM0MzExRUI5RDc1QzY1NkYwQTI3QThDIiB4bXBNTTpEb2N1bWVudElEPSJ4bXAuZGlkOjAxRDMwQzQxMTM0MzExRUI5RDc1QzY1NkYwQTI3QThDIj4gPHhtcE1NOkRlcml2ZWRGcm9tIHN0UmVmOmluc3RhbmNlSUQ9InhtcC5paWQ6MDFEMzBDM0UxMzQzMTFFQjlENzVDNjU2RjBBMjdBOEMiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6MDFEMzBDM0YxMzQzMTFFQjlENzVDNjU2RjBBMjdBOEMiLz4gPC9yZGY6RGVzY3JpcHRpb24+IDwvcmRmOlJERj4gPC94OnhtcG1ldGE+IDw/eHBhY2tldCBlbmQ9InIiPz6uDnKHAAAAHUlEQVR42mL8//8/AzJgAWJeZAFGdBWM6CoAAgwAKXwGHFeW7ZAAAAAASUVORK5CYII=";

		var stripe_2 = "kE3NTRENjgyMTM0RDExRUJBMDAzRjQwNjI0N0YzQTgwIiB4bXBNTTpEb2N1bWVudElEPSJ4bXAuZGlkOkE3NTRENjgzMTM0RDExRUJBMDAzRjQwNjI0N0YzQTgwIj4gPHhtcE1NOkRlcml2ZWRGcm9tIHN0UmVmOmluc3RhbmNlSUQ9InhtcC5paWQ6QTc1NEQ2ODAxMzREMTFFQkEwMDNGNDA2MjQ3RjNBODAiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6QTc1NEQ2ODExMzREMTFFQkEwMDNGNDA2MjQ3RjNBODAiLz4gPC9yZGY6RGVzY3JpcHRpb24+IDwvcmRmOlJERj4gPC94OnhtcG1ldGE+IDw/eHBhY2tldCBlbmQ9InIiPz4VfA3gAAAAHElEQVR42mL4//8/AxDzgmgg4GViQAOEBQACDAAysAkY0mYcuAAAAABJRU5ErkJggg==";

		var stripe_3 = "jkwREI0RjdDMTM1MjExRUJCMjQ5RjYwREIwREZBNURFIiB4bXBNTTpEb2N1bWVudElEPSJ4bXAuZGlkOjkwREI0RjdEMTM1MjExRUJCMjQ5RjYwREIwREZBNURFIj4gPHhtcE1NOkRlcml2ZWRGcm9tIHN0UmVmOmluc3RhbmNlSUQ9InhtcC5paWQ6OTBEQjRGN0ExMzUyMTFFQkIyNDlGNjBEQjBERkE1REUiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6OTBEQjRGN0IxMzUyMTFFQkIyNDlGNjBEQjBERkE1REUiLz4gPC9yZGY6RGVzY3JpcHRpb24+IDwvcmRmOlJERj4gPC94OnhtcG1ldGE+IDw/eHBhY2tldCBlbmQ9InIiPz7lSOxuAAAAI0lEQVR42mL4//8/AxDwggggmxdMwATBNIhAFoTLwAQBAgwANYghSAUNXOMAAAAASUVORK5CYII=";

		var stripe_4 = "kY1NEQyODJBMTM1MjExRUI5RjY4RkJGQjE5QzgwRTlBIiB4bXBNTTpEb2N1bWVudElEPSJ4bXAuZGlkOkY1NEQyODJCMTM1MjExRUI5RjY4RkJGQjE5QzgwRTlBIj4gPHhtcE1NOkRlcml2ZWRGcm9tIHN0UmVmOmluc3RhbmNlSUQ9InhtcC5paWQ6RjU0RDI4MjgxMzUyMTFFQjlGNjhGQkZCMTlDODBFOUEiIHN0UmVmOmRvY3VtZW50SUQ9InhtcC5kaWQ6RjU0RDI4MjkxMzUyMTFFQjlGNjhGQkZCMTlDODBFOUEiLz4gPC9yZGY6RGVzY3JpcHRpb24+IDwvcmRmOlJERj4gPC94OnhtcG1ldGE+IDw/eHBhY2tldCBlbmQ9InIiPz6bycTNAAAAJUlEQVR42mL4//8/LxAzAAEviGBA5oAkwRyQIJJKBmQOL0CAAQCaFRtONlQYDAAAAABJRU5ErkJggg==";

		initCSS();
!
999px

Console