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HTML

              
                <div class="container">
	<h2>2019 Mood Calendar</h2>
	<h4>~ color each day depending on what your mood was / is ~</h4>
	<p>Select mood:</p>
	<div class="moods_container">
		<button class="mood mood_1" id="mood_1">
			<i class="far fa-laugh"></i>
		</button>
		<button class="mood mood_2" id="mood_2">
			<i class="far fa-smile"></i>
		</button>
		<button class="mood mood_3" id="mood_3">
			<i class="far fa-meh"></i>
		</button>
		<button class="mood mood_4" id="mood_4">
			<i class="far fa-frown"></i>
		</button>
		<button class="mood mood_5" id="mood_5">
			<i class="far fa-sad-tear"></i>
		</button>
	</div>
	<p>then click on the circles below</p>
	<button id="randomize" class="action_btn randomize">
		<i class="fas fa-random"></i>
	</button>
	<button id="clear" class="action_btn clear">
		<i class="fas fa-sync"></i>
	</button>
	<div id="calendar" class="calendar"></div>
</div>

<!-- SOCIAL PANEL HTML -->
<div class="social-panel-container">
	<div class="social-panel">
		<p>Created with <i class="fa fa-heart"></i> by
			<a target="_blank" href="https://florin-pop.com">Florin Pop</a></p>
		<button class="close-btn"><i class="fas fa-times"></i></button>
		<h4>Get in touch on</h4>
		<ul>
			<li>
				<a href="https://twitter.com/florinpop1705" target="_blank">
					<i class="fab fa-twitter"></i>
				</a>
			</li>
			<li>
				<a href="https://linkedin.com/in/florinpop17" target="_blank">
					<i class="fab fa-linkedin"></i>
				</a>
			</li>
			<li>
				<a href="https://facebook.com/florinpop17" target="_blank">
					<i class="fab fa-facebook"></i>
				</a>
			</li>
			<li>
				<a href="https://instagram.com/florinpop17" target="_blank">
					<i class="fab fa-instagram"></i>
				</a>
			</li>
		</ul>
	</div>
</div>
<button class="floating-btn">
	Get in Touch
</button>

<div class="floating-text">
	Part of <a href="https://florin-pop.com/blog/2019/09/100-days-100-projects" target="_blank">#100Days100Projects</a>
</div>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Muli&display=swap');

* {
	box-sizing: border-box;
}

:root {
	--mood-color-1: #2d6b5f;
	--mood-color-2: #72e3a6;
	--mood-color-3: #dff4c7;
	--mood-color-4: #edbf98;
	--mood-color-5: #ea3d36;
}

body {
	font-family: 'Muli';
	margin: 40px 0;
}

h2 {
	margin-bottom: 0;
}

h4 {
	font-weight: 100;
	margin: 5px 0 20px;
}

p {
	margin: 5px 0;
}

.container {
	max-width: 1000px;
	margin: 0 auto;
	padding: 0 30px;
	text-align: center;
}

.moods_container {
	display: flex;
	justify-content: center;
	align-items: center;
}

.mood {
	background-color: #fff;
	border: 0;
	border-radius: 50%;
	color: #000;
	display: inline-flex;
	justify-content: center;
	align-items: center;
	font-size: 30px;
	line-height: 20px;
	padding: 0;
	margin: 0 5px;
	height: 40px;
	width: 40px;
	text-align: center;
}

.mood_1 {
	color: var(--mood-color-1);
}

.mood_2 {
	color: var(--mood-color-2);
}

.mood_3 {
	color: var(--mood-color-3);
}

.mood_4 {
	color: var(--mood-color-4);
}

.mood_5 {
	color: var(--mood-color-5);
}

.mood.selected {
	background-color: currentColor;
}

.mood.selected i {
	color: #fff;
}

.mood:active {
	transform: scale(0.9);
}

.mood:focus {
	outline: 0;
}

.mood i {
	cursor: pointer;
}

.calendar {
	display: flex;
	flex-wrap: wrap;
	justify-content: center;
	align-items: flex-start;
}

.months {
	padding: 10px;
	width: 33%;
}

@media screen and (max-width: 756px) {
	.months {
		width: 50%;	
	}
}

@media screen and (max-width: 480px) {
	.months {
		width: 100%;	
	}
}

.months h3 {
	margin: 5px 0;
	text-align: center;
}

.days_container,
.week_days_container {
	display: flex;
	flex-wrap: wrap;
}

.days,
.week_days {
	font-size: 14px;
	margin-bottom: 5px;
	height: calc(100% / 7);
	width: calc(100% / 7);
	text-align: center;
}

.days .circle {
	background-color: #888;
	border-radius: 50%;
	color: #fff;
	cursor: pointer;
	display: inline-flex;
	justify-content: center;
	align-items: center;
	font-size: 10px;
	width: 20px;
	height: 20px;
}

.days .circle:hover {
	transform: scale(1.1);
}

.action_btn {
	border-radius: 10px 0 0 10px;
	border: none;
	color: #fff;
	cursor: pointer;
	font-size: 14px;
	padding: 8px 12px;
	margin: 0;
	position: fixed;
	right: 0;
	top: 40px;
}

.action_btn:active {
	transform: scale(0.9);
}

.action_btn:focus {
	outline: 0;
}

.randomize {
	background-color: var(--mood-color-2);
}

.clear {
	background-color: #888;
	top: 80px;
}

/* SOCIAL PANEL CSS */
.social-panel-container {
	position: fixed;
	right: 0;
	bottom: 80px;
	transform: translateX(100%);
	transition: transform 0.4s ease-in-out;
}

.social-panel-container.visible {
	transform: translateX(-10px);
}

.social-panel {	
	background-color: #fff;
	border-radius: 16px;
	box-shadow: 0 16px 31px -17px rgba(0,31,97,0.6);
	border: 5px solid #001F61;
	display: flex;
	flex-direction: column;
	justify-content: center;
	align-items: center;
	font-family: 'Muli';
	position: relative;
	height: 169px;	
	width: 370px;
	max-width: calc(100% - 10px);
}

.social-panel button.close-btn {
	border: 0;
	color: #97A5CE;
	cursor: pointer;
	font-size: 20px;
	position: absolute;
	top: 5px;
	right: 5px;
}

.social-panel button.close-btn:focus {
	outline: none;
}

.social-panel p {
	background-color: #001F61;
	border-radius: 0 0 10px 10px;
	color: #fff;
	font-size: 14px;
	line-height: 18px;
	padding: 2px 17px 6px;
	position: absolute;
	top: 0;
	left: 50%;
	margin: 0;
	transform: translateX(-50%);
	text-align: center;
	width: 235px;
}

.social-panel p i {
	margin: 0 5px;
}

.social-panel p a {
	color: #FF7500;
	text-decoration: none;
}

.social-panel h4 {
	margin: 20px 0;
	color: #97A5CE;	
	font-family: 'Muli';	
	font-size: 14px;	
	line-height: 18px;
	text-transform: uppercase;
}

.social-panel ul {
	display: flex;
	list-style-type: none;
	padding: 0;
	margin: 0;
}

.social-panel ul li {
	margin: 0 10px;
}

.social-panel ul li a {
	border: 1px solid #DCE1F2;
	border-radius: 50%;
	color: #001F61;
	font-size: 20px;
	display: flex;
	justify-content: center;
	align-items: center;
	height: 50px;
	width: 50px;
	text-decoration: none;
}

.social-panel ul li a:hover {
	border-color: #FF6A00;
	box-shadow: 0 9px 12px -9px #FF6A00;
}

.floating-btn {
	border-radius: 26.5px;
	background-color: #001F61;
	border: 1px solid #001F61;
	box-shadow: 0 16px 22px -17px #03153B;
	color: #fff;
	cursor: pointer;
	font-size: 16px;
	line-height: 20px;
	padding: 12px 20px;
	position: fixed;
	bottom: 20px;
	right: 20px;
	z-index: 999;
}

.floating-btn:hover {
	background-color: #ffffff;
	color: #001F61;
}

.floating-btn:focus {
	outline: none;
}

.floating-text {
	background-color: #001F61;
	border-radius: 10px 10px 0 0;
	color: #fff;
	font-family: 'Muli';
	padding: 7px 15px;
	position: fixed;
	bottom: 0;
	left: 50%;
	transform: translateX(-50%);
}

.floating-text a {
	color: #FF7500;
	text-decoration: none;
}

@media screen and (max-width: 480px) {
	.social-panel-container.visible {
		transform: translateX(0px);
	}
	
	.floating-btn {
		right: 10px;
	}
}
              
            
!

JS

              
                const currentYear = 2019;
const weekDays = ['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
const months = [
	'January',
	'February',
	'March',
	'April',
	'May',
	'June',
	'July',
	'August',
	'September',
	'Octomber',
	'November',
	'December'
];
const colors = ['#2d6b5f', '#72e3a6', '#dff4c7', '#edbf98', '#ea3d36'];
const defaultColor = '#888';
let activeColor = '';

const calendar = document.getElementById('calendar');
const moods = document.querySelectorAll('.mood');
const randomize = document.querySelector('#randomize');
const clear = document.querySelector('#clear');

moods.forEach(mood => {
	mood.addEventListener('click', () => {
		// if is already selected, deselect it
		if (mood.classList.contains('selected')) {
			mood.classList.remove('selected');
			activeColor = defaultColor;
		} else {
			moods.forEach(mood => {
				mood.classList.remove('selected');
			});

			mood.classList.add('selected');
			activeColor = getComputedStyle(mood).getPropertyValue('color');
		}
	});
});

const getAllDays = year => {
	// First day of the year - 1st January
	const firstDay = new Date(`January 1 ${year}`);
	// Last day of the year - 31th December - used to stop adding days to the array
	const lastDay = new Date(`December 31 ${year}`);

	// Add first day
	const days = [firstDay];

	// Used to keep track of the day
	let lastDayInArray = firstDay;
	
	// Loop while there are new days to be added in the current year
	while (lastDayInArray.getTime() !== lastDay.getTime()) {
		days.push(addDays(lastDayInArray, 1));
		lastDayInArray = days[days.length - 1];
	}

	return days;
};

const dates = getAllDays(currentYear);

let monthsHTML = '';

// Loop over the months and create a div for each month
months.forEach((month, idx) => {
	monthsHTML += `<div class="months month_${idx}">
        <h3>${month}</h3>
        <div class="week_days_container">
            ${weekDays
							.map(day => `<div class="week_days">${day}</div>`)
							.join('')}
        </div>
        <div class="days_container"></div>
    </div>`;
});

calendar.innerHTML = monthsHTML;

// Loop over each day and
dates.forEach(date => {
	const month = date.getMonth();
	const monthEl = document.querySelector(`.month_${month} .days_container`);

	// create extra day slots if needed before day 1
	if (date.getDate() === 1 && date.getDay() !== 0) {
		for (let i = 0; i < date.getDay(); i++) {
			const emptySpot = createEmptySpot();

			monthEl.appendChild(emptySpot);
		}
	}

	const dateEl = createDateEl(date);

	monthEl.appendChild(dateEl);
});

// Add click event to all the .circles
const circles = document.querySelectorAll('.circle');
circles.forEach(circle => {
	circle.addEventListener('click', () => {
		circle.style.backgroundColor = activeColor;
	});
});

// Randomize functionality
randomize.addEventListener('click', () => {
	circles.forEach(circle => {
		circle.style.backgroundColor = getRandomColor();
	});
});

// Clear functionality
clear.addEventListener('click', () => {
	circles.forEach(circle => {
		circle.style.backgroundColor = defaultColor;
	});
});

function getRandomColor() {
	return colors[Math.floor(Math.random() * 5)];
}

function createDateEl(date) {
	const day = date.getDate();
	const dateEl = document.createElement('div');
	dateEl.classList.add('days');
	dateEl.innerHTML = `<span class="circle">${day}</span>`;

	return dateEl;
}

function createEmptySpot() {
	const emptyEl = document.createElement('div');
	emptyEl.classList.add('days');

	return emptyEl;
}

// function from StackOverflow: https://stackoverflow.com/questions/563406/add-days-to-javascript-date
function addDays(date, days) {
	var result = new Date(date);
	result.setDate(result.getDate() + days);
	return result;
}

// SOCIAL PANEL JS
const floating_btn = document.querySelector('.floating-btn');
const close_btn = document.querySelector('.close-btn');
const social_panel_container = document.querySelector('.social-panel-container');

floating_btn.addEventListener('click', () => {
	social_panel_container.classList.toggle('visible')
});

close_btn.addEventListener('click', () => {
	social_panel_container.classList.remove('visible')
});
              
            
!
999px

Console