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HTML 

              
                <div class="container">
	<div class="header">
		<h2>Create Account</h2>
	</div>
	<form id="form" class="form">
		<div class="form-control">
			<label for="username">Username</label>
			<input type="text" placeholder="florinpop17" id="username" />
			<i class="fas fa-check-circle"></i>
			<i class="fas fa-exclamation-circle"></i>
			<small>Error message</small>
		</div>
		<div class="form-control">
			<label for="username">Email</label>
			<input type="email" placeholder="a@florin-pop.com" id="email" />
			<i class="fas fa-check-circle"></i>
			<i class="fas fa-exclamation-circle"></i>
			<small>Error message</small>
		</div>
		<div class="form-control">
			<label for="username">Password</label>
			<input type="password" placeholder="Password" id="password"/>
			<i class="fas fa-check-circle"></i>
			<i class="fas fa-exclamation-circle"></i>
			<small>Error message</small>
		</div>
		<div class="form-control">
			<label for="username">Password check</label>
			<input type="password" placeholder="Password two" id="password2"/>
			<i class="fas fa-check-circle"></i>
			<i class="fas fa-exclamation-circle"></i>
			<small>Error message</small>
		</div>
		<button>Submit</button>
	</form>
</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://www.patreon.com/florinpop17" target="_blank">
					<i class="fab fa-discord"></i>
				</a>
			</li>
			<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');
@import url('https://fonts.googleapis.com/css?family=Open+Sans:400,500&display=swap');

* {
	box-sizing: border-box;
}

body {
	background-color: #9b59b6;
	font-family: 'Open Sans', sans-serif;
	display: flex;
	align-items: center;
	justify-content: center;
	min-height: 100vh;
	margin: 0;
}

.container {
	background-color: #fff;
	border-radius: 5px;
	box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
	overflow: hidden;
	width: 400px;
	max-width: 100%;
}

.header {
	border-bottom: 1px solid #f0f0f0;
	background-color: #f7f7f7;
	padding: 20px 40px;
}

.header h2 {
	margin: 0;
}

.form {
	padding: 30px 40px;	
}

.form-control {
	margin-bottom: 10px;
	padding-bottom: 20px;
	position: relative;
}

.form-control label {
	display: inline-block;
	margin-bottom: 5px;
}

.form-control input {
	border: 2px solid #f0f0f0;
	border-radius: 4px;
	display: block;
	font-family: inherit;
	font-size: 14px;
	padding: 10px;
	width: 100%;
}

.form-control input:focus {
	outline: 0;
	border-color: #777;
}

.form-control.success input {
	border-color: #2ecc71;
}

.form-control.error input {
	border-color: #e74c3c;
}

.form-control i {
	visibility: hidden;
	position: absolute;
	top: 40px;
	right: 10px;
}

.form-control.success i.fa-check-circle {
	color: #2ecc71;
	visibility: visible;
}

.form-control.error i.fa-exclamation-circle {
	color: #e74c3c;
	visibility: visible;
}

.form-control small {
	color: #e74c3c;
	position: absolute;
	bottom: 0;
	left: 0;
	visibility: hidden;
}

.form-control.error small {
	visibility: visible;
}

.form button {
	background-color: #8e44ad;
	border: 2px solid #8e44ad;
	border-radius: 4px;
	color: #fff;
	display: block;
	font-family: inherit;
	font-size: 16px;
	padding: 10px;
	margin-top: 20px;
	width: 100%;
}









/* 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%);
	text-align: center;
	z-index: 998;
}

.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 form = document.getElementById('form');
const username = document.getElementById('username');
const email = document.getElementById('email');
const password = document.getElementById('password');
const password2 = document.getElementById('password2');

form.addEventListener('submit', e => {
	e.preventDefault();
	
	checkInputs();
});

function checkInputs() {
	// trim to remove the whitespaces
	const usernameValue = username.value.trim();
	const emailValue = email.value.trim();
	const passwordValue = password.value.trim();
	const password2Value = password2.value.trim();
	
	if(usernameValue === '') {
		setErrorFor(username, 'Username cannot be blank');
	} else {
		setSuccessFor(username);
	}
	
	if(emailValue === '') {
		setErrorFor(email, 'Email cannot be blank');
	} else if (!isEmail(emailValue)) {
		setErrorFor(email, 'Not a valid email');
	} else {
		setSuccessFor(email);
	}
	
	if(passwordValue === '') {
		setErrorFor(password, 'Password cannot be blank');
	} else {
		setSuccessFor(password);
	}
	
	if(password2Value === '') {
		setErrorFor(password2, 'Password2 cannot be blank');
	} else if(passwordValue !== password2Value) {
		setErrorFor(password2, 'Passwords does not match');
	} else{
		setSuccessFor(password2);
	}
}

function setErrorFor(input, message) {
	const formControl = input.parentElement;
	const small = formControl.querySelector('small');
	formControl.className = 'form-control error';
	small.innerText = message;
}

function setSuccessFor(input) {
	const formControl = input.parentElement;
	formControl.className = 'form-control success';
}
	
function isEmail(email) {
	return /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/.test(email);
}













// 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