<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="navbar-top bg-dark text-white d-none d-md-block ">
<div class="container">
<div class="row py-1 ">
<div class="col-md-4 col-sm-6 col-xs-12 ">
<p class="no-mp">
Welcome To <strong>Osahan</strong> Property!
</p>
</div>
<div class="col-md-8 col-sm-6 col-xs-12 text-right">
<ul class="list-inline no-mp">
<a href="#" class="text-light"><li class="list-inline-item pl-4 pr-3 "> info@oproperty.com </li></a>
<a href="#" class="text-light"><li class="list-inline-item border-left pl-2 pr-2 "> +1-123-456-7890 </li></a>
<a href="#" class="text-light"><li class="list-inline-item border-left pl-2 pr-2"> Contact Us </li></a>
<a href="#" class="text-light"><li class="list-inline-item border-left pl-2 ">DOWNLOAD APP </li></a>
</ul>
</div>
</div>
</div>
</div>
<nav class="navbar navbar-expand-sm border ">
<div class="container">
<!-- Brand -->
<a class="navbar-brand" href="#">
<img src="http://sarto.edge-themes.com/wp-content/uploads/2018/04/landing-img-18.png" alt="Logo" style="width:70px;">
</a>
<!-- Toggler/collapsibe Button -->
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsibleNavbar">
<span class="navbar-toggler-icon"></span>
</button>
<!-- Navbar links -->
<div class="collapse navbar-collapse" id="collapsibleNavbar">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">About Us</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">How it works</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Reference</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Employer</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-toggle="dropdown">
More
</a>
<div class="dropdown-menu">
<a class="dropdown-item" href="#">Company</a>
<a class="dropdown-item" href="#">Latest </a>
<a class="dropdown-item" href="#">Popular </a>
<a class="dropdown-item" href="#">Upcoming </a>
<a class="dropdown-item" href="#">Offers </a>
</div>
</li>
<form class="form-inline" action="#">
<input class="form-control mr-sm-2" type="text" placeholder="Search ">
<button class="btn btn-success" type="submit"><i class="fa fa-search"></i> Search</button>
</form>
<button type="button" class="btn btn-light"data-toggle="modal" data-target="#toploginModal">Login</button>
<button type="button" class="btn btn-light"data-toggle="modal" data-target="#toploginModal">Refer Me</button>
</ul>
</div>
</div>
</nav>
.no-mp {margin:0px;padding:0px;}
.navbar {
background-color: #ea3e00;
}
.navbar .navbar-brand {
color: #ecf0f1;
}
.navbar .navbar-brand:hover,
.navbar .navbar-brand:focus {
color: #eaeaea;
}
.navbar .navbar-text {
color: #ecf0f1;
}
.navbar .navbar-text a {
color: #eaeaea;
}
.navbar .navbar-text a:hover,
.navbar .navbar-text a:focus {
color: #eaeaea;
}
.navbar .navbar-nav .nav-link {
color: #ecf0f1;
border-radius: .25rem;
margin: 0 0.25em;
}
.navbar .navbar-nav .nav-link:not(.disabled):hover,
.navbar .navbar-nav .nav-link:not(.disabled):focus {
color: #eaeaea;
}
.navbar .navbar-nav .nav-item.active .nav-link,
.navbar .navbar-nav .nav-item.active .nav-link:hover,
.navbar .navbar-nav .nav-item.active .nav-link:focus,
.navbar .navbar-nav .nav-item.show .nav-link,
.navbar .navbar-nav .nav-item.show .nav-link:hover,
.navbar .navbar-nav .nav-item.show .nav-link:focus {
color: #eaeaea;
background-color: #d93a00;
}
.navbar .navbar-toggle {
border-color: #d93a00;
}
.navbar .navbar-toggle:hover,
.navbar .navbar-toggle:focus {
background-color: #d93a00;
}
.navbar .navbar-toggle .navbar-toggler-icon {
color: #ecf0f1;
}
.navbar .navbar-collapse,
.navbar .navbar-form {
border-color: #ecf0f1;
}
.navbar .navbar-link {
color: #ecf0f1;
}
.navbar .navbar-link:hover {
color: #eaeaea;
}
@media (max-width: 575px) {
.navbar-expand-sm .navbar-nav .show .dropdown-menu .dropdown-item {
color: #ecf0f1;
}
.navbar-expand-sm .navbar-nav .show .dropdown-menu .dropdown-item:hover,
.navbar-expand-sm .navbar-nav .show .dropdown-menu .dropdown-item:focus {
color: #eaeaea;
}
.navbar-expand-sm .navbar-nav .show .dropdown-menu .dropdown-item.active {
color: #eaeaea;
background-color: #d93a00;
}
}
@media (max-width: 767px) {
.navbar-expand-md .navbar-nav .show .dropdown-menu .dropdown-item {
color: #ecf0f1;
}
.navbar-expand-md .navbar-nav .show .dropdown-menu .dropdown-item:hover,
.navbar-expand-md .navbar-nav .show .dropdown-menu .dropdown-item:focus {
color: #eaeaea;
}
.navbar-expand-md .navbar-nav .show .dropdown-menu .dropdown-item.active {
color: #eaeaea;
background-color: #d93a00;
}
}
@media (max-width: 991px) {
.navbar-expand-lg .navbar-nav .show .dropdown-menu .dropdown-item {
color: #ecf0f1;
}
.navbar-expand-lg .navbar-nav .show .dropdown-menu .dropdown-item:hover,
.navbar-expand-lg .navbar-nav .show .dropdown-menu .dropdown-item:focus {
color: #eaeaea;
}
.navbar-expand-lg .navbar-nav .show .dropdown-menu .dropdown-item.active {
color: #eaeaea;
background-color: #d93a00;
}
}
@media (max-width: 1199px) {
.navbar-expand-xl .navbar-nav .show .dropdown-menu .dropdown-item {
color: #ecf0f1;
}
.navbar-expand-xl .navbar-nav .show .dropdown-menu .dropdown-item:hover,
.navbar-expand-xl .navbar-nav .show .dropdown-menu .dropdown-item:focus {
color: #eaeaea;
}
.navbar-expand-xl .navbar-nav .show .dropdown-menu .dropdown-item.active {
color: #eaeaea;
background-color: #d93a00;
}
}
.navbar-expand .navbar-nav .show .dropdown-menu .dropdown-item {
color: #ecf0f1;
}
.navbar-expand .navbar-nav .show .dropdown-menu .dropdown-item:hover,
.navbar-expand .navbar-nav .show .dropdown-menu .dropdown-item:focus {
color: #eaeaea;
}
.navbar-expand .navbar-nav .show .dropdown-menu .dropdown-item.active {
color: #eaeaea;
background-color: #d93a00;
}
<section class="aboutus py-5" id="aboutus">
<div class="container">
</div>
</section>
<div class="row">
<div class="col-md-3 col-sm-6 col-xs-12 ">Col 1</div>
<div class="col-md-3 col-sm-6 col-xs-12">Col 2</div>
<div class="clearfix visible-sm"></div>
<div class="col-md-3 col-sm-6 col-xs-12 ">Col 3</div>
<div class="col-md-3 col-sm-6 col-xs-12">Col 4</div>
</div>
https://www.codeply.com/go/JVP2nxfv0p/bootstrap-4-forms
https://bootstrapformbuilder.com/
https://www.w3schools.com/bootstrap4/default.asp
https://getbootstrap.com/docs/4.0/components/alerts/
----- Navigation -----
https://bootsnipp.com/user/snippets/O5dKl
<button type="button" class="btn btn-primary">Get More Details</button>
<div class="col-md-6 offset-md-3">