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CSS Base

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              <div id="info-container" class="info-container">
	<div><i id="times" class="fas fa-times"></i></div>
	<p id="info" class="info">Hover (click for mobile) over the <code>sup</code> and <code>sub</code> elements to reveal a tooltip.</p>
</div>
<div class="card">
	<p class="symbol">H<sub data-tooltip="Two atoms of hydrogen.">2</sub>O</p>
	<p><strong>H<sub data-tooltip="Two atoms of hydrogen.">2</sub>O</strong> is the chemical formula for water, ice or steam which consists of <strong>two atoms of hydrogen</strong> and <strong>one atom of oxygen</strong>.</p>
	<p>Water is a <strong>transparent</strong>, <strong>tasteless</strong>, <strong>odorless</strong>, and <strong>nearly colorless</strong> chemical substance that is the main constituent of Earth's streams, lakes, and oceans, and the fluids of most living organisms.</p>
	<p>Water covers <strong>71%</strong> of the Earth's surface.<sup data-tooltip="1. CIA – The world factbook. Central Intelligence Agency. Retrieved 20 December 2008.">1</sup> It is vital for all known forms of life.</p>
	<p class="footnote">1. <a target="_blank" href="https://www.cia.gov/library/publications/the-world-factbook/geos/xx.html#Geo">CIA – The world factbook. Central Intelligence Agency. Retrieved 20 December 2008</a></p>
<!-- https://www.cia.gov/library/publications/the-world-factbook/geos/xx.html#Geo	 -->
	<div class="element">
		<a href="#"><i class="fas fa-arrow-left"></i></a>
		<p class="element-name">Water</p>
		<a href="#"><i class="fas fa-arrow-right"></i></a>
	</div>
</div>
            
          
!
            
              html {
	box-sizing: border-box;
}
*,
*:before,
*:after {
	box-sizing: inherit;
}
body {
	font-family: 'Work Sans', sans-serif;
	font-weight: 300;
	margin: 30px 0;
	background: #20A4F3;
	position: relative;
	background-image: url('https://s3.amazonaws.com/graphics-jaymie/sea-creatures.png');
	background-size: cover;
}
a {
	text-decoration: none;
	color: grey;
}
p {
	font-size: 14px;
	color: grey;
	line-height: 1.6em;
}
strong {
	font-weight: bold;
}
div.info-container {
	max-width: 350px;
	border-radius: 10px;
	padding: 20px;
	margin: 0 auto 30px auto;
	background: rgba(255,255,255,0.9);
}
p.info {
	font-size: 12px;
}
p.symbol {
	margin: 0;
	font-family: 'Abril Fatface', serif;
	font-size: 40px;
	color: #20A4F3;
	text-align: center;
}
p.element-name {
	display: inline;
	margin: 0 70px;
}
i.fas.fa-times {
	color: #20A4F3;
}
p.footnote {
	font-size: 10px;
}
div.card {
	padding: 20px;
	background: rgba(255, 255, 255, 0.9);
	height: 475px;
	border-radius: 10px;
	margin: 0 auto;
	max-width: 350px;
	position: relative;
/* 	box-shadow: 0px 0px 20px 2px #7FB7BE; */
}
div.element {
	text-align: center;
	background: #e1e2de;
	color: grey;
	padding: 15px;
	position: absolute;
	bottom: 0;
	left: 0;
	border-radius: 0 0px 10px 10px;
	width: 100%;
}
i.fas.fa-arrow-left,
i.fas.fa-arrow-right {
	display: inline-block;
}
/* thank you: https://codepen.io/jaymierosen/pen/vjwONj */
/* Tooltip Styles */
/* Add this attribute to the element that needs a tooltip */
[data-tooltip] {
	position: relative;
	z-index: 2;
	cursor: pointer;
}
/* Hide the tooltip content by default */
[data-tooltip]:before,
[data-tooltip]:after {
	visibility: hidden;
	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=0)";
	filter: progid: DXImageTransform.Microsoft.Alpha(Opacity=0);
	opacity: 0;
	pointer-events: none;
}
/* Position tooltip above the element */
[data-tooltip]:before {
	position: absolute;
	bottom: 150%;
	left: 50%;
	margin-bottom: 5px;
	margin-left: -80px;
	padding: 7px;
	width: 150px;
	-webkit-border-radius: 3px;
	-moz-border-radius: 3px;
	border-radius: 3px;
	background-color: #000;
	background-color: #D65780;
	color: #fff;
	content: attr(data-tooltip);
	text-align: center;
	font-size: 14px;
	line-height: 1.2;
}
/* Triangle hack to make tooltip look like a speech bubble */
[data-tooltip]:after {
	position: absolute;
	bottom: 150%;
	left: 50%;
	margin-left: -5px;
	width: 0;
	border-top: 5px solid #000;
	border-top: 5px solid #D65780;
	border-right: 5px solid transparent;
	border-left: 5px solid transparent;
	content: " ";
	font-size: 0;
	line-height: 0;
}
/* Show tooltip content on hover */
[data-tooltip]:hover:before,
[data-tooltip]:hover:after {
	visibility: visible;
	-ms-filter: "progid:DXImageTransform.Microsoft.Alpha(Opacity=100)";
	filter: progid: DXImageTransform.Microsoft.Alpha(Opacity=100);
	opacity: 1;
}

            
          
!
            
              const times = document.getElementById('times');
const iconContainer = document.getElementById('info-container');
// let infoP = document.getElementById('info');
times.onclick = function() {
	click();
};
function click() {
	iconContainer.style.display = 'none';
}
            
          
!
999px
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