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About the <head>

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CSS

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JavaScript

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HTML 

              
                <!DOCTORTYPE html>
<html lang ="en" dir="ltr">
<head>
  <meta charset="utf-8">
  <link rel="stylesheet" type="text/css" href="Survey.css">
  <script src="https://kit.fontawesome.com/a076d05399.js"></script>
  <meta name="viewport" content="width-device-width, initial-scale=1.0">
  <link href="https://fonts.googleapis.com/css2?family=Poppins:wght@200&display=swap" rel="stylesheet">
  <title>Multi Step Form</title>
  </head>
<body>
  <div class="container">
    <header>Signup Form</header>
    <div class= "progress-bar">
      <div class="step">
        <p>Name</p>
        <div class="bullet">
          <span>1</span>
      </div>
      <div class="check fas fa-check">
      </div>
    </div>

      <div class="step">
        <p>Contact</p>
        <div class="bullet">
          <span>2</span>
      </div>
      <div class="check fas fa-check">
      </div>
      </div>

      <div class="step">
        <p>Birth</p>
        <div class="bullet">
          <span>3</span>
      </div>
      <div class="check fas fa-check">
      </div>  
      </div>

      <div class="step">
        <p>Submit</p>
        <div class="bullet">
          <span>4</span>
      </div>
      <div class="check fas fa-check">
      </div>
      </div>
    </div>
    <div class="form-outer">
      <form action="#">
        <div class="page slidepage">
          <div class="title">Basic Info:</div>
          <div class="field">
            <div class="label">First Name</div>
            <input type="text">
          </div>
          <div class="field">
            <div class="label">Last Name</div>
            <input type="text">
          </div>
          <div class="field nextBtn">
            <button>Next</button>
          </div>
          </div>

        <div class="page">
          <div class="title">Contact Info</div>
          <div class="field">
            <div class="label">Email Address</div>
            <input type="text">
          </div>
          <div class="field">
            <div class="label">Phone Number</div>
            <input type="number">
          </div>
          <div class="field btns">
            <button class="prev-1 prev">Previous</button>
            <button class="next-1 next">Next</button>
          </div>
          </div>
        
        <div class="page">
          <div class="title">Date of Birth</div>
          <div class="field">
            <div class="label">Date</div>
            <input type="text">
          </div>
          <div class="field">
            <div class="label">Gender</div>
            <select>
              <option>Male</option>
              <option>Female</option>
              <option>Other</option>
            </select>
          </div>
          <div class="field btns">
            <button class="prev-2 prev">Previous</button>
            <button class="next-2 next">Next</button>
          </div>
          </div>
        
       
        <div class="page">
          <div class="title">Login Details</div>
          <div class="field">
            <div class="label">Username</div>
            <input type="text">
          </div>
          <div class="field">
            <div class="label">Password</div>
            <input type="password">
          </div>
          <div class="field btns">
            <button class="prev-3 prev">Previous</button>
            <button class="Submit">Submit</button>
          </div>
          </div>
        </form>
      </div>
  </div>
  <script src="script.js"></script>
</body>
</html>
!

CSS 

              
                @import url('https://fonts.googleapis.com/css?family=Poppins:400,500,600,700&display=swap');
*{
  margin: 0;
  padding: 0;
  outline: none;
  font-family: 'Poppins', sans-serif;
}
body{
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  overflow: hidden;
  background: url("bg.png"), -webkit-linear-gradient(bottom, #0250c5, #d43f8d);
}
::selection{
  color: #fff;
  background: #d43f8d;
}
.container{
  width: 330px;
  background: #fff;
  text-align: center;
  border-radius: 5px;
  padding: 50px 35px 10px 35px;
}
.container header{
  font-size: 35px;
  font-weight: 600;
  margin: 0 0 30px 0;
}
.container .form-outer{
  width: 100%;
  overflow: hidden;
}
.container .form-outer form{
  display: flex;
  width: 400%;
}
.form-outer form .page{
  width: 25%;
  transition: margin-left 0.3s ease-in-out;
}
.form-outer form .page .title{
  text-align: left;
  font-size: 25px;
  font-weight: 500;
}
.form-outer form .page .field{
  width: 330px;
  height: 45px;
  margin: 45px 0;
  display: flex;
  position: relative;
}
form .page .field .label{
  position: absolute;
  top: -30px;
  font-weight: 500;
}
form .page .field input{
  height: 100%;
  width: 100%;
  border: 1px solid lightgrey;
  border-radius: 5px;
  padding-left: 15px;
  font-size: 18px;
}
form .page .field select{
  width: 100%;
  padding-left: 10px;
  font-size: 17px;
  font-weight: 500;
}
form .page .field button{
  width: 100%;
  height: calc(100% + 5px);
  border: none;
  background: #d33f8d;
  margin-top: -20px;
  border-radius: 5px;
  color: #fff;
  cursor: pointer;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 1px;
  text-transform: uppercase;
  transition: 0.5s ease;
}
form .page .field button:hover{
  background: #000;
}
form .page .btns button{
  margin-top: -20px!important;
}
form .page .btns button.prev{
  margin-right: 3px;
  font-size: 17px;
}
form .page .btns button.next{
  margin-left: 3px;
}
.container .progress-bar{
  display: flex;
  margin: 40px 0;
  user-select: none;
}
.container .progress-bar .step{
  position: relative;
  text-align: center;
  width: 100%;
}
.container .progress-bar .step p{
  font-size: 18px;
  font-weight: 500;
  color: #000;
  margin-bottom: 8px;
  transition: 0.2s;
}
.progress-bar .step p.active{
  color: blue;
}
.progress-bar .step .bullet{
  height: 25px;
  width: 25px;
  border: 2px solid #000;
  display: inline-block;
  border-radius: 50%;
  position: relative;
  transition: 0.2s;
  font-weight: 500;
  font-size: 17px;
  line-height: 25px;
}
.progress-bar .step .bullet.active{
  border-color: #d43f8d;
  background: #d43f8d;
}
.progress-bar .step .bullet span{
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}
.progress-bar .step .bullet.active span{
  display: none;
}
.progress-bar .step .bullet:before,
.progress-bar .step .bullet:after{
  position: absolute;
  content: '';
  bottom: 11px;
  right: -51px;
  height: 3px;
  width: 44px;
  background: #262626;
}
.progress-bar .step .bullet.active:after{
  background: #d43f8d;
  transform: scaleX(0);
  transform-origin: left;
  animation: animate 0.3s linear forwards;
}
@keyframes animate {
  100%{
    transform: scaleX(1);
  }
}
.progress-bar .step:last-child .bullet:before,
.progress-bar .step:last-child .bullet:after{
  display: none;
}
.progress-bar .step p.active{
  color: #d43f8d;
  transition: 0.2s linear;
}
.progress-bar .step .check{
  position: absolute;
  left: 50%;
  top: 70%;
  font-size: 15px;
  transform: translate(-50%, -50%);
  display: none;
}
.progress-bar .step .check.active{
  display: block;
  color: #fff;
}
!

JS 

              
                const slidePage = document.querySelector(".slidepage");
const firstNextBtn = document.querySelector(".nextBtn");
const prevBtnSec = document.querySelector(".prev-1");
const nextBtnSec = document.querySelector(".next-1");
const prevBtnThird = document.querySelector(".prev-2");
const nextBtnThird = document.querySelector(".next-2");
const prevBtnFourth = document.querySelector(".prev-3");
const submitBtn = document.querySelector(".submit");
const progressText = document.querySelectorAll(".step p");
const progressCheck = document.querySelectorAll(".step .check");
const bullet = document.querySelectorAll(".step .bullet");
let max = 4;
let current = 1;



firstNextBtn.addEventListener("click", function (){
	slidePage.style.marginLeft = "-25%";
	bullet[current - 1].classList.add("active");
	progressText[current - 1].classList.add("active");
	progressCheck[current - 1].classList.add("active");
	current += 1;
})
nextBtnSec.addEventListener("click", function (){
	slidePage.style.marginLeft = "-50%";
	bullet[current - 1].classList.add("active");
	progressText[current - 1].classList.add("active");
	progressCheck[current - 1].classList.add("active");
	current += 1;
})
nextBtnThird.addEventListener("click", function (){
	slidePage.style.marginLeft = "-75%";
	bullet[current - 1].classList.add("active");
	progressText[current - 1].classList.add("active");
	progressCheck[current - 1].classList.add("active");
	current += 1;
})
submitBtn.addEventListener("click", function (){
	bullet[current - 1].classList.add("active");
	progressText[current - 1].classList.add("active");
	progressCheck[current - 1].classList.add("active");
	current += 1;
	setTimeout(function (){
		alert("You´re successfully Signed up ♥");
		location.reload();
	}, 800)
})

prevBtnSec.addEventListener("click", function (){
	slidePage.style.marginLeft = "0%";
	bullet[current - 2].classList.remove("active");
	progressText[current - 2].classList.remove("active");
	progressCheck[current - 2].classList.remove("active");
	current -= 1;
})
prevBtnThird.addEventListener("click", function (){
	slidePage.style.marginLeft = "-25%";
	bullet[current - 2].classList.remove("active");
	progressText[current - 2].classList.remove("active");
	progressCheck[current - 2].classList.remove("active");
	current -= 1;
})
prevBtnFourth.addEventListener("click", function (){
	slidePage.style.marginLeft = "-50%";
	bullet[current - 2].classList.remove("active");
	progressText[current - 2].classList.remove("active");
	progressCheck[current - 2].classList.remove("active");
	current -= 1;
})
!
999px

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