style1.css

@import url('https://fonts.googleapis.com/css?family=Montserrat:400,800');

* {
	box-sizing: border-box;
}

body {
	background-image:url('images/sign_bg.png');
	background-size:100% 100%;
	display: flex;
	justify-content: center;
	align-items: center;
	flex-direction: column;
	font-family: 'Montserrat', sans-serif;
	height: 100vh;
	margin: -20px 0 50px;
}

h1 {
	font-weight: bold;
	margin: 0;
}

h2 {
	text-align: center;
}

p {
	font-size: 14px;
	font-weight: 100;
	line-height: 20px;
	letter-spacing: 0.5px;
	margin: 20px 0 30px;
}

span {
	font-size: 12px;
}

a {
	color: #333;
	font-size: 14px;
	text-decoration: none;
	margin: 15px 0;
}

button 
{
	border-radius: 20px;
	border: 1px solid #FF4B2B;
	background-color: #FF7527;
	color: #FFFFFF;
	font-size: 12px;
	font-weight: bold;
	padding: 12px 45px;
	letter-spacing: 1px;
	text-transform: uppercase;
	transition: transform 80ms ease-in;
}

button:active {
	transform: scale(0.95);
}

button:focus {
	outline: none;
}

button.ghost {
	background-color: transparent;
	border-color: #FFFFFF;
}

.btn
{
	border-radius: 30px;
	border: 1px solid #FF7527;
	background-color: #FF7527;
	color: #FFFFFF;
	font-size: 12px;
	font-weight: bold;
	padding: 12px 45px;
	letter-spacing: 1px;
	text-transform: uppercase;
	transition: transform 80ms ease-in;
}

.bt:active
{
	transform: scale(0.95);
}

.bt:focus 
{
	outline: none;
}

form {
	background-color: #FFFFFF;
	display: flex;
	align-items: center;
	justify-content: center;
	flex-direction: column;
	padding: 0 50px;
	height: 100%;
	text-align: center;
}

input {
	background-color: #eee;
	border: none;
	padding: 12px 15px;
	margin: 8px 0;
	width: 100%;
}

.container {
	background-color: #fff;
	border-radius: 10px;
  	box-shadow: 0 14px 28px rgba(0,0,0,0.25), 
			0 10px 10px rgba(0,0,0,0.22);
	position: relative;
	overflow: hidden;
	width: 768px;
	max-width: 100%;
	min-height: 480px;
}

.form-container {
	position: absolute;
	top: 0;
	height: 100%;
	transition: all 0.6s ease-in-out;
}

.sign-in-container {
	left: 0;
	width: 50%;
	z-index: 2;
}

.container.right-panel-active .sign-in-container {
	transform: translateX(100%);
}

.sign-up-container {
	left: 0;
	width: 50%;
	opacity: 0;
	z-index: 1;
}

.container.right-panel-active .sign-up-container {
	transform: translateX(100%);
	opacity: 1;
	z-index: 5;
	animation: show 0.6s;
}

@keyframes show {
	0%, 49.99% {
		opacity: 0;
		z-index: 1;
	}
	
	50%, 100% {
		opacity: 1;
		z-index: 5;
	}
}

.overlay-container {
	position: absolute;
	top: 0;
	left: 50%;
	width: 50%;
	height: 100%;
	overflow: hidden;
	transition: transform 0.6s ease-in-out;
	z-index: 100;
}

.container.right-panel-active .overlay-container{
	transform: translateX(-100%);
}

.overlay {
	background: #FF7527;
	background: -webkit-linear-gradient(to right, #3620db, #FF7527);
	background: linear-gradient(to right, #3620db, #FF7527);
	background-repeat: no-repeat;
	background-size: cover;
	background-position: 0 0;
	color: #FFFFFF;
	position: relative;
	left: -100%;
	height: 100%;
	width: 200%;
  	transform: translateX(0);
	transition: transform 0.6s ease-in-out;
}

.container.right-panel-active .overlay {
  	transform: translateX(50%);
}

.overlay-panel {
	position: absolute;
	display: flex;
	align-items: center;
	justify-content: center;
	flex-direction: column;
	padding: 0 40px;
	text-align: center;
	top: 0;
	height: 100%;
	width: 50%;
	transform: translateX(0);
	transition: transform 0.6s ease-in-out;
}

.overlay-left {
	transform: translateX(-20%);
}

.container.right-panel-active .overlay-left {
	transform: translateX(0);
}

.overlay-right {
	right: 0;
	transform: translateX(0);
}

.container.right-panel-active .overlay-right {
	transform: translateX(20%);
}

.social-container {
	margin: 20px 0;
}

.social-container a {
	border: 1px solid #DDDDDD;
	border-radius: 50%;
	display: inline-flex;
	justify-content: center;
	align-items: center;
	margin: 0 5px;
	height: 40px;
	width: 40px;
}

input {
  display: block;
  width: 300px;
  padding: 0.75rem;
  border: 1px solid #ccc;
  border-radius: 0.25rem;
}

.width-50 {
  width: 50%;
}

.ml-auto {
  margin-left: auto;
}

.text-center {
  text-align: center;
}

/* Progressbar */
.progressbar {
  position: relative;
  display: flex;
  justify-content: center;
  counter-reset: step;
  margin: 20px 0px 40px 0px;
}

.progressbar::before,
.progress {
  content: "";
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  height: 4px;
  width: 100%;
  background-color: #dcdcdc;
  z-index: -1;
}

.progress {
  background-color: #FF7527;
  width: 0%;
  transition: 0.3s;
}

.progress-step {
  width: 2.1875rem;
  height: 2.1875rem;
  background-color: #dcdcdc;
  border-radius: 50%;
  display: flex;
  justify-content: center;
  align-items: center;
}

.progress-step::before {
  counter-increment: step;
  content: counter(step);
}

.progress-step::after {
  content: attr(data-title);
  position: absolute;
  top: calc(100% + 0.5rem);
  font-size: 0.85rem;
  color: #666;
}

.progress-step-active {
  background-color: #FF7527;
  color: #f3f3f3;
}

/* Form */
.form {
  width: clamp(320px, 30%, 430px);
  margin: 0 auto 0;
  border-radius: 0.35rem;
  padding: 1.5rem;
}

.form-step {
  display: none;
  transform-origin: top;
  animation: animate 0.5s;
}

.form-step-active {
  display: block;
}

.input-group {
  margin-bottom: 10px;
}

@keyframes animate {
  from {
    transform: scale(1, 0);
    opacity: 0;
  }
  to {
    transform: scale(1, 1);
    opacity: 1;
  }
}

/* Button */
.btns-group {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.btn {
  padding: 0.75rem;
  display: block;
  text-decoration: none;
  background-color:#FF7527;
  color: #f3f3f3;
  text-align: center;
  border-radius: 0.25rem;
  cursor: pointer;
  transition: 0.3s;
}
.btn:hover {
  box-shadow: 0 0 0 2px #fff, 0 0 0 3px #FF7527;
}