<div class="container container-main">
<div class="row justify-content-center">
<div class="form-container">
<form id="demoForm">
<ul id="progress_steps" class="d-flex justify-content-center">
<li class="active" id="step_1"></li>
<li id="step_2"></li>
<li id="step_3"></li>
<li id="step_4"></li>
<li id="step_5"></li>
</ul>

<fieldset>
<div class="input-info">In Albanian, this animal is called '<strong>tigër</strong>'. What is it called in English?</div>
<div class="input-container">
<input type="text" maxlength="10" class="form-control form-input-text" name="question-01" value="" autocomplete="off" />
<div class="error-message-input-container">
<div class="input-error-check"></div>
</div>
</div> 
<button type="button" class="btn btn-secondary form-button-next next-step"><span class="form-button-next-label"><i class="fa-solid fa-circle-arrow-right"></i></span>NEXT</button> 
</fieldset>

<fieldset>
<div class="input-info">In Albanian, this animal is called '<strong>antilopë</strong>'. What is it called in English?</div>
<div class="input-container">
<input type="text" class="form-control form-input-text" name="question-02" value="" autocomplete="off" />
<div class="error-message-input-container">
<div class="input-error-check"></div>
</div>
</div>
<button type="button" class="btn btn-secondary form-button-previous previous-step"><span class="form-button-previous-label"><i class="fa-solid fa-circle-arrow-left"></i></span>PREVIOUS</button> 
<button type="button" class="btn btn-secondary form-button-next next-step"><span class="form-button-next-label"><i class="fa-solid fa-circle-arrow-right"></i></span>NEXT</button> 
</fieldset>

<fieldset>
<div class="input-info">In Albanian, this animal is called '<strong>krokodil</strong>'. What is it called in English?</div>
<div class="input-container">
<input type="text" class="form-control form-input-text" name="question-03" value="" autocomplete="off" />
<div class="error-message-input-container">
<div class="input-error-check"></div>
</div>
</div>
<button type="button" class="btn btn-secondary form-button-previous previous-step"><span class="form-button-previous-label"><i class="fa-solid fa-circle-arrow-left"></i></span>PREVIOUS</button> 
<button type="button" class="btn btn-secondary form-button-next next-step"><span class="form-button-next-label"><i class="fa-solid fa-circle-arrow-right"></i></span>NEXT</button> 
</fieldset>

<fieldset>
<div class="input-info">In Albanian, this animal is called '<strong>elefant</strong>'. What is it called in English?</div>
<div class="input-container">
<input type="text" class="form-control form-input-text" name="question-04" value="" autocomplete="off" />
<div class="error-message-input-container">
<div class="input-error-check"></div>
</div>
</div>
<button type="button" class="btn btn-secondary form-button-previous previous-step"><span class="form-button-previous-label"><i class="fa-solid fa-circle-arrow-left"></i></span>PREVIOUS</button> 
<button type="button" class="btn btn-secondary form-button-next next-step"><span class="form-button-next-label"><i class="fa-solid fa-circle-arrow-right"></i></span>NEXT</button> 
</fieldset>


<fieldset>
<div class="input-info">In Albanian, this animal is called '<strong>zebra</strong>'. What is it called in English?</div>
<div class="input-container">
<input type="text" class="form-control form-input-text" name="question-05" value="" autocomplete="off" />
<div class="error-message-input-container">
<div class="input-error-check"></div>
</div>
</div>
<button type="button" class="btn btn-secondary form-button-previous previous-step"><span class="form-button-previous-label"><i class="fa-solid fa-circle-arrow-left"></i></span>PREVIOUS</button> 
<button type="button" class="btn btn-secondary form-button-next next-step"><span class="form-button-next-label"><i class="fa-solid fa-circle-arrow-right"></i></span>NEXT</button> 
</fieldset>

<fieldset>
<div class="form-finish-question">
<p>Are you SURE you have answered all the questions correctly?</p>
</div>
<button type="button" class="btn btn-secondary form-button-previous previous-step"><span class="form-button-previous-label"><i class="fa-solid fa-circle-arrow-left"></i></span>PREVIOUS</button>
<button type="button" class="btn btn-success form-button-submit next-step" id="buttonSubmit" ><span class="form-button-submit-label"><i class="fa-solid fa-share-from-square"></i></span>SUBMIT</button> 
</fieldset>

</form>

<div id="messageAfterSubmit"></div>

<div id="progress-container">
<div class="progress">
<div class="progress-bar" role="progressbar" aria-valuemin="0" aria-valuemax="100"></div>
</div>
</div>

</div>
</div>

</div>

.container-main {
  padding: 0 1rem 0 1rem;
  border: 1px solid rgba(100, 100, 100, 0.24);
  background: radial-gradient(circle at 10% 20%, rgba(216, 241, 230, 0.46) 0.1%, rgba(233, 226, 226, 0.28) 90.1%);
}

#demoForm {
  position: relative;
  margin-top: 20px;
}

#demoForm fieldset {
  border: 0 none;
  border-radius: 0.5rem;
  box-sizing: border-box;
  width: 100%;
  margin: 0;
  padding-bottom: 20px;
  position: relative
}

#demoForm fieldset:not(:first-of-type) {
  display: none
}

#progress_steps {
  margin-bottom: 30px;
  margin-right: 40px;
  overflow: hidden;
  text-align: center;
  color: #9A9A9A;
}

#progress_steps .active {
  color: #2F8D46;
}

#progress_steps li {
  list-style-type: none;
  font-size: 15px;
  width: 10%;
  float: left;
  position: relative;
  z-index: 2;
  font-weight: 400;
}

#progress_steps #step_1:before {
  content: "1";
}

#progress_steps #step_2:before {
  content: "2";
}

#progress_steps #step_3:before {
  content: "3";
}

#progress_steps #step_4:before {
  content: "4";
}

#progress_steps #step_5:before {
  content: "5";
}

#progress_steps #step_6:before {
  content: "6";
}

#progress_steps #step_7:before {
  content: "7";
}

#progress_steps #step_8:before {
  content: "8";
}

#progress_steps #step_9:before {
  content: "9";
}

#progress_steps li:before {
  width: 24px;
  height: 24px;
  line-height: 20px;
  display: block;
  font-size: 14px;
  color: #ffffff;
  background: lightgray;
  border-radius: 50%;
  margin: 0 auto 5px auto;
  padding: 2px;
}

#progress_steps li:after {
  content: '';
  width: 100%;
  height: 2px;
  background: lightgray;
  position: absolute;
  left: 0;
  top: 12px;
  z-index: -1;
}

#progress_steps li.active:before,
  #progress_steps li.active:after {
  background: #61677C;
}

#progress-container {
  margin-top: 1rem;
}

.progress {
  height: 4px;
  margin: 0;
  border-radius: 0 !important;
  font-size: 11px;
  letter-spacing: 1px;
}

.progress-bar {
  background-color: #b9b9bd;
}

.input-info {
  padding: 1em;
  background-color: rgba(71, 70, 70, 0.10);
  border-radius: 10px;
  text-align: center;
  margin-bottom: 2rem;
}

.previous-step {
  float: left;
}

.next-step {
  float: right;
}

.input-container {
  margin: 2em 0;
}

.form-input-text {
  width: 100%;
}

.error-message-input-container {
  height: 40px;
  padding-top: 10px;
}

.error-message-input-content {
  font-size: 11px;
  color: #FF0004;
  padding-left: 32px;
  position: relative;
}

.error-message-input-content::before {
  position: absolute;
  font-family: 'FontAwesome';
  top: 0;
  left: 0;
  content: "\f071";
}

.input-error-state {
  background-color: rgba(255, 132, 134, 0.1);
}

.form-container {
  max-width: 600px;
}

.form-container .input-container {
  margin: 0 auto;
  max-width: 190px;
}

.form-container .form-button-next {
  position: relative;
  width: 129px;
  padding: 4px 6px 4px 12px;
  text-align: left;
}

.form-container .form-button-next-label {
  position: absolute;
  top: 0;
  right: 0;
  display: inline-block;
  padding: 4px 6px;
  background: rgba(0, 0, 0, 0.15);
  border-radius: 0 3px 3px 0;
}

.form-container .form-button-previous {
  position: relative;
  width: 129px;
  padding: 4px 6px 4px 40px;
  text-align: left;
}

.form-container .form-button-previous-label {
  position: absolute;
  top: 0;
  left: 0;
  display: inline-block;
  padding: 4px 6px;
  background: rgba(0, 0, 0, 0.15);
  border-radius: 3px 0 0 3px;
}

.form-container .form-button-submit {
  position: relative;
  width: 129px;
  padding: 4px 6px 4px 12px;
  text-align: left;
}

.form-container .form-button-submit-label {
  position: absolute;
  top: 0;
  right: 0;
  display: inline-block;
  padding: 4px 6px;
  background: rgba(0, 0, 0, 0.15);
  border-radius: 0 3px 3px 0;
}

.form-container .button-next {
  float: right;
}

.form-container .button-previous {
  float: left;
}

.form-container .button-submit {
  float: right;
}

.form-finish-question {
  margin-bottom: 2rem;
  padding: 2em 0;
  text-align: center;
  border-radius: 6px;
  background-color: rgba(104, 104, 104, 0.12);
  border: 1px solid rgba(104, 104, 104, 0.24);
}


.result-content {
  padding: 2em 0;
  margin-bottom: 2rem;
  text-align: center;
  border-radius: 6px;
  background-color: rgba(104, 104, 104, 0.12);
  border: 1px solid rgba(104, 104, 104, 0.24);
}

$(document).ready(function() {

var currentMsfStep, nextMsfStep, previousMsfStep;
var opacity;
var current = 1;
var steps = $("fieldset").length;

setProgressSteps(current);

$(".next-step").click(function() {

if ($('.input-container input[type=text]:visible').val() == '') {
$('.input-container input[type=text]:visible').addClass('input-error-state');
$('.input-container .input-error-check:visible').html('<div class="error-message-input-content">Please answer the question</div>');
return false;
}

currentMsfStep = $(this).parent();
nextMsfStep = $(this).parent().next();
$("#progress_steps li").eq($("fieldset")
.index(nextMsfStep)).addClass("active");
nextMsfStep.show();
currentMsfStep.animate({
opacity: 0
}, {
step: function(now) {
opacity = 1 - now;
currentMsfStep.css({
'display': 'none',
'position': 'relative'
});
nextMsfStep.css({
'opacity': opacity
});
},
duration: 500
});
setProgressSteps(++current);
});

$(".previous-step").click(function() {
currentMsfStep = $(this).parent();
previousMsfStep = $(this).parent().prev();
$("#progress_steps li").eq($("fieldset")
.index(currentMsfStep)).removeClass("active");

previousMsfStep.show();
currentMsfStep.animate({
opacity: 0
}, {
step: function(now) {
opacity = 1 - now;
currentMsfStep.css({
'display': 'none',
'position': 'relative'
});
previousMsfStep.css({
'opacity': opacity
});
},
duration: 500
});
setProgressSteps(--current);
});

function setProgressSteps(currentStep) {
var percent = parseFloat(100 / steps) * current;
percent = percent.toFixed();
$(".progress-bar").css("width", percent + "%");
$('.input-error-check').html('');
$('input[type=text]').removeClass('input-error-state');
}

$("#buttonSubmit").click(function(event) {
$.ajax({
type: 'post',
url: 'post.php',
data: $('#demoForm').serialize(),
success: function (data) {
$("#messageAfterSubmit").html(data);
}
});
event.preventDefault();
}); 

});

<?php

$answer_01 = $_POST['question-01'];
$answer_02 = $_POST['question-02'];
$answer_03 = $_POST['question-03'];
$answer_04 = $_POST['question-04'];
$answer_05 = $_POST['question-05'];
$answer_06 = $_POST['question-06'];

$totalRight = 0;

if ($answer_01 == "tiger" or $answer_01 == "Tiger") { $totalRight++; }
if ($answer_02 == "antilope" or $answer_02 == "Antilope") { $totalRight++; }
if ($answer_03 == "crocodile" or $answer_03 == "Crocodile") { $totalRight++; }
if ($answer_04 == "elephant" or $answer_04 == "Elephant") { $totalRight++; }
if ($answer_05 == "zebra" or $answer_05 == "Zebra") { $totalRight++; }

// result:

if ($totalRight == 0 ) {
$result = '<p><strong>All</strong> answers are <strong>incorrent</strong></p>
<p><a href="/snippets/php/a-simple-jquery-and-ajax-quiz-with-text-fields-with-multiple-steps/">TRY AGAIN</a></p>';
}

if ($totalRight == 1 ) {
$result = '<p>Only <strong>one</strong> answer is <strong>correct</strong></p>
<p><a href="/snippets/php/a-simple-jquery-and-ajax-quiz-with-text-fields-with-multiple-steps/">TRY AGAIN</a></p>';
}

if ($totalRight == 2 ) {
$result = '<p><strong>Two</strong> answers are <strong>correct</strong></p>
<p><a href="/snippets/php/a-simple-jquery-and-ajax-quiz-with-text-fields-with-multiple-steps/">TRY AGAIN</a></p>';
}

if ($totalRight == 3 ) {
$result = '<p><strong>Three</strong> answers are <strong>correct</strong></p>
<p><a href="/snippets/php/a-simple-jquery-and-ajax-quiz-with-text-fields-with-multiple-steps/">TRY AGAIN</a></p>';
}

if ($totalRight == 4 ) {
$result = '<p><strong>Four</strong> answers are <strong>correct</strong></p>
<p><a href="/snippets/php/a-simple-jquery-and-ajax-quiz-with-text-fields-with-multiple-steps/">TRY AGAIN</a></p>';
}

if ($totalRight == 5 ) {
$result = '<p><strong>All</strong> answers are <strong>correct</strong></p>
<p>WELL DONE!</p>';
}

echo '<div class="result-content">'; 
echo '' . $result . ''; 
echo '</div>'; 

?>