JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html lang="ru">
<head>
	<meta charset="UTF-8">
	<title>Империя Sky</title>
	<link rel="stylesheet" href="./css/style.css">
	<script src="./js/jquery-3.1.0.min.js"></script>
	<link href="./lib/jquery-ui-1.12.0.custom/jquery-ui.css" rel="stylesheet" type="text/css"/>
	<script src="./lib/jquery-ui-1.12.0.custom/jquery-ui.js"></script>
	<script src="./js/main.js"></script>
</head>
<body>
	<header>
		<div class="container header clearfix">
			<div class="left-column">
				<img src="./img/logo.png" alt="">
				<p>г.Москва, Пресненская Набережная д.6 к.2</p>
				<p>ММДЦ "Москва-Сити" Башня "Империя"</p>
			</div>
			<div class="right-column">
				<div class="phone">
					<p class="colored">+7 (915) 335-89-08</p>
					<p>OPEN 24/7</p>
				</div>
				<div class="buttons">
					<div class="button-call">Заказать звонок</div>
					<a href="./files/test.pdf" download>Скачать презентацию</a>
				</div>
			</div>
		</div>
	</header>
	<nav>
		<div id="menu" class="container nav">
			<ul >
				<li><a href="#video" class="video-nav-icon"><img src="./img/blank.gif" alt=""></a></li>
				<li><a href="#whyus" class="whyus-nav-icon"><img src="./img/blank.gif" alt=""></a></li>
				<li><a href="#possibility" class="possibility-nav-icon"><img src="./img/blank.gif" alt=""></a></li>
				<li><a href="#gallery" class="photo-nav-icon"><img src="./img/blank.gif" alt=""></a></li>
				<li><a href="#price" class="price-nav-icon"><img src="./img/blank.gif" alt=""></a></li>
				<li><a href="#portfolio" class="portfolio-nav-icon"><img src="./img/blank.gif" alt=""></a></li>
				<li><a href="#contacts" class="contacts-nav-icon"><img src="./img/blank.gif" alt=""></a></li>
			</ul>
		</div>
	</nav>
	<section id="main">
		<div class="background"><h1>Проведение мероприятий в LOFT “ИМПЕРИЯ-SKY”</h1></div>
		<div class="main container">
			<div class="head">
				<div class="bash">
					<ul...

CSS

/*--General--*/
* {
	font-family: pt-sans, sans-serif, tahoma, arial;
	box-sizing: border-box;
	font-weight: normal;
	font-size: 100%;
	padding: 0;
	margin: 0;
}
html, body {
	height: 100%;
}
a {
	text-decoration: none;
	color: #000;
}
ul {
	list-style: none;
}
.clearfix::before, .clearfix::after {
	overflow: hidden;
	display: block;
	content: '';
	height: 0px;
	clear: both;
}
.container {
	max-width: 1200px;
	margin: 0 auto;
	width: 100%;
}
.fixed {
	position: fixed;
	top: 0;
	left: 0;
	width: 100%;
	margin: 0 auto;
	z-index: 1001;
}
/*--MainPage -> Header--*/
header {
	height: 100%;
	max-height: 123px;
}
.header {
	padding: 0 66px;
	height: 100%;
	max-height: 123px;
}
.left-column {
	display: inline-block;
	float: left;
	width: 50%;
}
.right-column {
	display: inline-block;
	height: 100%;
	width: 50%;
		max-height: 123px;
	float: left;
}
.left-column > img {
	height: 100%;
	width: 100%;
	max-width: 188px;
	max-height: 79px;
}
.left-column > p {
	line-height: 20px;
    text-align: left;
    font-size: 17px;
    color: #652CAB;
    font-weight: bold;
    word-wrap: break-word;
}
.right-column > .phone {
	width: calc(100% - 175px);
	display: inline-block;
	padding-left: 13%;
	height: 100%;
	float:left;
}
.right-column > .phone > p {
	text-transform: uppercase;
	text-align: center;
	font-weight: 700;
	font-size: 27px;
	color: #FF7B00;
	height: 50%;
}
.right-column > .phone > p.colored {
	padding-top: 11%;
	color: #612CAA;
	font-size: 31px;
}
.right-column > .buttons {
	display: inline-block;
	text-align: center;
	padding: 12px 0;
	float: right;
	width: 175px;
}
.right-column > .buttons > .button-call, .right-column > .buttons > a {
	width: 178px;
}
.right-column > .buttons > .button-call {
	height: 47px;
	line-height: 44px;
	text-align: center;
	font-size: 17px;
	color: #fff;
	font-weight: bold;
	border: 2px solid #FFD326;
    border-radius: 50px;
    background: linear-gradient(to bottom,#FFC700 ,#FF7B00 100%);
    cursor: pointer;
}
.right-column > .buttons >...

JavaScript

console.log('Welcome Mr.Ten')

$(document).ready(function() {
	$('.action > form > input').hover(function() {
		$('.action > form').css('padding-top','18px')
	},
	function() {
		$('.action > form').css('padding-top', '20px')
	})
	$(window).scroll(function () {
  		if ($(window).scrollTop() > 123) {
   	 		$('nav').addClass('fixed');
    	} else {
    		$('nav').removeClass('fixed');
  		}
 	});
 	$('.center-pos, .center-pos-full').hover(function(){
 		$('.center-pos').css('display', 'none');
 		$('.center-pos-full').css('display','block')
 	}, function() {
 		$('.center-pos').css('display', 'block');
 		$('.center-pos-full').css('display','none')
 	})
   $("#menu").on("click","a", function (event) {
        event.preventDefault();
        var id  = $(this).attr('href'),
        top = $(id).offset().top;
        $('body,html').animate({scrollTop: top - 100}, 1500);
    });
   $(window).scroll(function() {
    if (window.scrollY >= 956 && window.scrollY <=1531) {
        $('.video-nav-icon').addClass('active-menu')
    } else {
      $('.video-nav-icon').removeClass('active-menu')
    }
    if (window.scrollY >= 1531 && window.scrollY <=2411) {
        $('.whyus-nav-icon').addClass('active-menu')
    } else {
      $('.whyus-nav-icon').removeClass('active-menu')
    }
    if (window.scrollY >= 2411 && window.scrollY <=3355) {
        $('.possibility-nav-icon').addClass('active-menu')
    } else {
      $('.possibility-nav-icon').removeClass('active-menu')
    }
    if (window.scrollY >= 3355 && window.scrollY <=4095) {
        $('.photo-nav-icon').addClass('active-menu')
    } else {
      $('.photo-nav-icon').removeClass('active-menu')
    }
    if (window.scrollY >= 4095 && window.scrollY <= 4733) {
        $('.price-nav-icon').addClass('active-menu')
    } else {
      $('.price-nav-icon').removeClass('active-menu')
    }
    if (window.scrollY >= 4733 && window.scrollY <= 5359) {
        $('.portfolio-nav-icon').addClass('active-menu')
    } else {
     ...