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Adding Classes

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About the <head>

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!
Insecure Resource

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CSS

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CSS Base

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JavaScript

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HTML 

              
                <!DOCTYPE html>

<html>

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

  <meta name="viewport" content="width=device-width, initial-scale=1" />

  <title>Stanislav Andreev</title>

  <!-- normalize css -->

  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/normalize/5.0.0/normalize.min.css" />

  <!-- https://fonts.google.com/ -->

  <link href="https://fonts.googleapis.com/css?family=Quicksand" rel="stylesheet" type="text/css" />

  <!-- https://fontawesome.com/ -->

  <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.6.3/css/all.css" integrity="sha384-UHRtZLI+pbxtHCWp1t77Bi1L4ZtiqrqD80Kn4Z8NTSRyMA2Fd33n5dQ8lWUE00s/" crossorigin="anonymous" />

  <link href="css/style.css" rel="stylesheet" type="text/css" />

</head>

<body>
  <!-- Header and nav -->

  <header>
    <section id="nav">
      <div class="wrapper">
        <nav class="site-nav ">
          <!-- <h1 class="logo">Atech<span>Seva</span></h1> -->

          <h1 class="logo"><img src="https://www.atechseva.com/images/atechseva-logo.webp" alt="" /></h1>

          <div class="menu-toggle">
            <div class="hamburger"></div>
          </div>

          <ul class="open desktop">
            <li>
              <a href="javascript:void(0)" id="one"><i class="fas fa-home site-nav--icon"></i>Home</a>
            </li>

            <li>
              <a href="javascript:void(0)"><i class="fas fa-users site-nav--icon"></i>About us</a>
            </li>

            <li>
              <a href="javascript:void(0)"><i class="fas fa-download site-nav--icon"></i>Service</a>
            </li>

            <li>
              <a href="javascript:void(0)"><i class="fas fa-globe site-nav--icon"></i>Blog</a>
            </li>

            <li>
              <a href="javascript:void(0)"><i class="fas fa-phone site-nav--icon"></i>Contact us</a>
            </li>
          </ul>
        </nav>
      </div>
    </section>
  </header>
  <!-- script for navigation menu -->
  <script src="https://code.jquery.com/jquery-3.4.1.min.js" integrity="sha384-vk5WoKIaW/vJyUAd9n/wmopsmNhiy+L2Z+SBxGYnUkunIxVxAv/UtMOhba/xskxh" crossorigin="anonymous"></script>
  <script src="js/01.js"></script>
</body>

</html>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css2?family=Montserrat:wght@300&display=swap");
* {
  box-sizing: border-box;
}

body {
  font-family: "Montserrat", sans-serif;
  letter-spacing: 2px;
  font-size: 1rem;
}

#nav {
  width: 100%;
  margin: 0 auto;
  background: #f7f7f7;
  border-bottom: 1px solid #e9e9e9;
}

.wrapper {
  width: 100%;
  max-width: 1060px;
  margin: 0 auto;
}

.logo img {
  width: 200px;
}
.menu-toggle {
  position: absolute;
  padding: 0.8em;
  top: 1em;
  right: 0.5em;
  cursor: pointer;
}

.hamburger,
.hamburger::before,
.hamburger::after {
  content: "";
  display: block;
  background: #2a2a2a;
  height: 3px;
  width: 2em;
  border-radius: 3px;
  -webkit-transition: all ease-in-out 350ms;
  transition: all ease-in-out 350ms;
}

.hamburger::before {
  -webkit-transform: translateY(-7px);
  transform: translateY(-7px);
}

.hamburger::after {
  -webkit-transform: translateY(4px);
  transform: translateY(4px);
}

.open .hamburger {
  -webkit-transform: rotate(45deg);
  transform: rotate(45deg);
}

.open .hamburger::before {
  display: none;
}

.open .hamburger::after {
  -webkit-transform: translateY(-1px) rotate(-90deg);
  transform: translateY(-1px) rotate(-90deg);
}

nav {
  margin: 0;
  padding: 0;
}

nav ul {
  display: flex;
  flex-direction: column;
  list-style-type: none;
  padding: 0;
  margin: 0;
  display: none;
}

nav ul.opening {
  display: block;
  height: 30px;
}

nav li {
  border-bottom: 1px solid #f6f4e2;
}
nav li:last-child {
  border-bottom: none;
}
nav a {
  color: #ebebd3;
  background: #333;
  display: block;
  padding: 1.5em 4em 1.5em 1em;
  text-transform: capitalize;
  text-decoration: none;
}

nav a:hover,
nav a:focus {
  color: rgb(32, 128, 255);
}

.site-nav--icon {
  font-size: 1.4em;
  margin-right: 1em;
  width: 1.1em;
  text-align: right;
  color: rgba(255, 255, 255, 0.4);
}

@media (min-width: 780px) {
  .menu-toggle {
    display: none;
  }

  nav ul {
    display: flex;
    flex-direction: row;
    justify-content: flex-end;
  }
  nav li {
    flex: 1 1 auto;
    border: none;
  }

  nav li a {
    padding: 1.5em 1.3em 1.5em 1.3em;
    margin: 0;
    border: none;
    background-color: #f7f7f7;
    color: black;
    font-weight: 600;
  }
  nav a:hover,
  nav a:focus {
    background-color: rgba(255, 255, 255, 0.1);
  }

  .logo {
    flex: 0 0 0 200px;
    margin: 0;
  }

  nav {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    text-align: center;
    background-color: #f7f7f7;
  }

  .site-nav--icon {
    display: none;
  }
}
html,
body,
address,
blockquote,
div,
dl,
form,
h1,
h2,
h3,
h4,
h5,
h6,
ol,
p,
pre,
table,
ul,
dd,
dt,
li,
tbody,
td,
tfoot,
th,
thead,
tr,
button,
del,
ins,
map,
object,
a,
abbr,
acronym,
b,
bdo,
big,
br,
cite,
code,
dfn,
em,
i,
kbd,
q,
samp,
small,
span,
strong,
sub,
sup,
tt,
var,
legend,
fieldset,
figure,
figcaption {
  margin: 0;
  padding: 0;
}

header {
  display: table;
  width: 100%;
  height: 100%;
  padding: 0;
  margin: 0;
  background: url(images/header.jpg) no-repeat bottom center scroll;
  background-color: none;
  float: left;
  -webkit-background-size: cover;
  -moz-background-size: cover;
  background-size: cover;
  -o-background-size: cover;
  filter: grayscale(60%);
  -webkit-filter: grayscale(60%);
}

section {
  width: 100%;
  padding: 0;
  margin: 0;
  float: left;
  background: none;
}
!

JS 

              
                $.noConflict();
jQuery(document).ready(function ($) {
  $(".menu-toggle").click(function () {
    $("ul").toggleClass("opening");
    $(this).toggleClass("open");
  });
});
!
999px

Console