Bootstrap 4 - alpha 6 Nav Tabs

HTML

<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/js/bootstrap.min.js"></script>

		<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
		<link rel="stylesheet" type="text/css" href="custom.css">
		<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
  		<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
  		<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

<div class="container">
	<div class="row">
		<section>
	        <div class="wizard">
	            <div class="wizard-inner">
	                <div class="active-line"></div>
	                <ul class="nav nav-tabs" role="tablist">
	                    <li role="presentation" class="active stepactive1">
	                		<div class="connecting-line border-right"></div>
	                        <a href="#step1" data-toggle="tab" aria-controls="step1" role="tab" title="Step 1">
	                            <span class="round-tab">
	                            	1
	                            </span>
	                            <p>Create Account</p>
	                        </a>
	                    </li>
	                    <li role="presentation" class="disabled stepactive2">
	                		<div class="connecting-line border-right border-left"></div>
	                        <a href="#step2" data-toggle="tab" aria-controls="step2" role="tab" title="Step 2">
	                            <span class="round-tab">
	                            	2
	                            </span>
	                           ...

SCSS

.wizard {
    background: #f1f1f1;
    padding: 30px;
}
.wizard .nav-tabs {
    position: relative;
    border: 0px;
}
.wizard > div.wizard-inner {
    position: relative;
}
.connecting-line{
    height:15px;
    background: #e0e0e0;
    position: absolute;
    width: 99.5%;
    margin: 0 auto;
    left: 0;
    right: 0;
    top:44%;
    z-index: 1;
    border-radius: 15px;
}
.active-line{
    height:15px;
    background: #e0e0e0;
    position: absolute;
    width: 99.5%;
    margin: 0 auto;
    left: 0;
    right: 0;
    top:44%;
    z-index: 1;
    border-radius: 15px !important;
}
.active .connecting-line{
    background-color: #2ED4E0;
}
.border-right{
    border-radius: 15px 0 0 15px;
}
.border-left{
    border-radius: 0;
}
.wizard .nav-tabs > li.active > a, .wizard .nav-tabs > li.active > a:hover, .wizard .nav-tabs > li.active > a:focus {
    cursor: default;
    border: 0;
    color:#2ED4E0;
    border-bottom-color: transparent;
}
.nav-tabs li p{
    padding-top:70px;
    font-size: 16px;
    text-align: center;
}
.list-inline{
    text-align: center;
}
span.round-tab {
    width: 70px;
    height: 70px;
    line-height: 70px;
    display: inline-block;
    border-radius: 100px;
    background:#DFE3E4;
    border: 2px solid #fff;
    z-index:1;
    position:absolute;
    text-align: center;
    font-size: 25px;
}
.wizard li.active span.round-tab{
    background:#2ED4E0;
    color:white;
    border: 2px solid #fff;
}
span.round-tab:hover{
    color: white;
    border: 2px solid #fff;
    background-color:#2ED4E0; 
}
.wizard .nav-tabs > li {
    width: 25%;
}
.wizard .nav-tabs > li a{
    width: 70px;
    height: 70px;
    margin: 20px auto;
    border-radius: 100%;
    padding: 0;
    color: #777;
}
.wizard .tab-pane {
    position: relative;
    padding-top: 15px;
    border-top: 1px solid #fff;
    margin-top: 50px;
}
.next-step:hover, .next-step, .prev-step:hover, .prev-step{
    position: relative;
    background-color: #2ED4E0;
    font-size: 16px;
   ...

JavaScript

$(document).ready(function () {
    $('.nav-tabs > li a[title]').tooltip();
      
    $('a[data-toggle="tab"]').on('show.bs.tab', function (e) {
        
        alert("asdasdasd");
        var $target = $(e.target);
           
        if ($target.parent().hasClass('disabled')) {
            return false;
        }
    });
      
    $(".next-step").click(function (e) {
      
        var $active = $('.wizard .nav-tabs li.active');
        $active.next().removeClass('disabled');
        nextTab($active);

        $('.wizard .nav-tabs li.active .connecting-line').css({"border-bottom-left-radius": 0, "border-top-left-radius": 0});

    });
    $(".prev-step").click(function (e) {

        var $active = $('.wizard .nav-tabs li.active');
        prevTab($active);
        
    });
});
function nextTab(elem) {
    $(elem).next().find('a[data-toggle="tab"]').click();
}
function prevTab(elem) {
    $(elem).prev().find('a[data-toggle="tab"]').click();
}