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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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HTML 

              
                <header class="header" id="header">
   <nav class="navbar container">
      <a href="#" class="brand">Brand</a>
      <div class="burger" id="burger">
         <span class="burger-line"></span>
         <span class="burger-line"></span>
         <span class="burger-line"></span>
      </div>
      <div class="menu" id="menu">
         <ul class="menu-inner">
            <li class="menu-item"><a href="#" class="menu-link">Home</a></li>
            <li class="menu-item"><a href="#" class="menu-link">Feature</a></li>
            <li class="menu-item"><a href="#" class="menu-link">Pricing</a></li>
            <li class="menu-item"><a href="#" class="menu-link">Support</a></li>
         </ul>
      </div>
      <button class="switch" id="switch">
         <i class="switch-light bx bx-sun"></i>
         <i class="switch-dark bx bx-moon"></i>
      </button>
   </nav>
</header>
<main class="main">
   <section class="section banner banner-section">
      <div class="container banner-column">
         <img class="banner-image" src="https://i.ibb.co/sVqYmS2/Illustration.png" alt="Illustration">
         <div class="banner-inner">
            <h1 class="heading-xl">All Your Files in One Secure Location.</h1>
            <p class="paragraph">
               We stores all your most important files in one secure location.
               Access them whenever needed, share and collaborate with
               your connections.
            </p>
            <button class="btn btn-darken btn-inline">
               Get Started<i class="bx bx-right-arrow-alt"></i>
            </button>
         </div>
      </div>
   </section>
</main>
!

CSS 

              
                :root {
   --color-white-100: hsl(206, 0%, 100%);
   --color-white-200: hsl(206, 0%, 90%);
   --color-white-300: hsl(206, 0%, 80%);
   --color-white-400: hsl(206, 0%, 65%);
   --color-white-500: hsl(206, 0%, 50%);

   --color-black-100: hsl(217, 30%, 18%);
   --color-black-200: hsl(217, 27%, 15%);
   --color-black-300: hsl(217, 27%, 12%);
   --color-black-400: hsl(217, 52%, 9%);

   --color-blue-100: hsl(215, 97%, 87%);
   --color-blue-200: hsl(215, 96%, 78%);
   --color-blue-300: hsl(215, 94%, 68%);
   --color-blue-400: hsl(215, 91%, 60%);
   --color-blue-500: hsl(215, 83%, 53%);
   --color-blue-600: hsl(215, 76%, 48%);

   --shadow-small: 0 1px 3px 0 rgba(0, 0, 0, 0.1),
      0 1px 2px 0 rgba(0, 0, 0, 0.06);
   --shadow-medium: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
      0 2px 4px -1px rgba(0, 0, 0, 0.06);
   --shadow-large: 0 10px 15px -3px rgba(0, 0, 0, 0.1),
      0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

*,
*::before,
*::after {
   padding: 0;
   margin: 0;
   box-sizing: border-box;
   list-style: none;
   list-style-type: none;
   text-decoration: none;
   -webkit-font-smoothing: antialiased;
   -moz-osx-font-smoothing: grayscale;
   text-rendering: optimizeLegibility;
}

html {
   font-size: 100%;
   box-sizing: inherit;
   scroll-behavior: smooth;
   height: -webkit-fill-available;
}

body {
   font-family: "Poppins", sans-serif;
   font-size: clamp(1rem, 2vw, 1.125rem);
   font-weight: 400;
   line-height: 1.5;
   color: var(--color-black-400);
   background-color: var(--color-white-100);

   &.darkmode {
      color: var(--color-white-100);
      background-color: var(--color-black-400);
   }
}

main {
   overflow: hidden;
}

p {
   text-wrap: balance;
}

a,
button {
   cursor: pointer;
   user-select: none;
   border: none;
   outline: none;
   background: none;
}

img,
video {
   display: block;
   max-width: 100%;
   height: auto;
   object-fit: cover;
}

// Elements
.section {
   margin: 0 auto;
   padding: 5rem 0 2rem;
}

.container {
   max-width: 75rem;
   height: auto;
   margin: 0 auto;
   padding: 0 1.25rem;
}

.paragraph {
   font-family: inherit;
   text-wrap: balance;
   color: inherit;
}

.heading {
   &-xl {
      font-family: inherit;
      font-size: clamp(2.648rem, 6vw, 4.241rem);
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -1px;
   }

   &-lg {
      font-family: inherit;
      font-size: clamp(2.179rem, 5vw, 3.176rem);
      font-weight: 700;
      line-height: 1.15;
      letter-spacing: -1px;
   }

   &-md {
      font-family: inherit;
      font-size: clamp(1.794rem, 4vw, 2.379rem);
      font-weight: 700;
      line-height: 1.25;
      letter-spacing: -1px;
   }
}

.btn {
   display: inline-block;
   font-family: inherit;
   font-size: 0.95rem;
   font-weight: 500;
   line-height: 1.5;
   text-align: center;
   vertical-align: middle;
   white-space: nowrap;
   user-select: none;
   outline: none;
   border: none;
   border-radius: 0.25rem;
   text-transform: unset;
   transition: all 0.3s ease-in-out;

   &-inline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      column-gap: 0.5rem;
   }

   &-darken {
      padding: 0.75rem 2rem;
      color: var(--color-white-100);
      background-color: var(--color-black-200);
      box-shadow: var(--shadow-medium);

      .darkmode & {
         background-color: var(--color-blue-500);
      }
   }
}

// Headers
.header {
   position: fixed;
   top: 0;
   left: 0;
   z-index: 100;
   width: 100%;
   height: auto;
   margin: 0 auto;
   background-color: var(--color-white-100);
   box-shadow: var(--shadow-medium);

   .darkmode & {
      background-color: var(--color-black-400);
   }
}

.navbar {
   display: flex;
   flex-direction: row;
   align-items: center;
   align-content: center;
   justify-content: space-between;
   width: 100%;
   height: 4rem;
   margin: 0 auto;
}

.brand {
   font-family: inherit;
   font-size: 1.6rem;
   font-weight: 600;
   line-height: 1.25;
   margin-right: auto;
   letter-spacing: -1px;
   text-transform: uppercase;
   color: var(--color-blue-500);

   .darkmode & {
      color: var(--color-white-100);
   }
}

.menu {
   position: fixed;
   top: 0;
   left: -100%;
   z-index: 10;
   width: 100%;
   height: 100vh;
   overflow: hidden;
   color: var(--color-black-400);
   background-color: var(--color-white-100);
   box-shadow: var(--shadow-medium);
   transition: all 0.4s ease-in-out;

   .darkmode & {
      color: var(--color-white-100);
      background-color: var(--color-black-400);
   }

   &.is-active {
      left: 0;
   }

   &-inner {
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      row-gap: 1.25rem;
      margin-top: 7rem;
   }

   &-link {
      font-family: inherit;
      font-size: 1rem;
      font-weight: 500;
      line-height: 1.5;
      color: inherit;
      text-transform: uppercase;
      transition: all 0.3s ease;
   }

   // Responsive Media Query
   @media only screen and (min-width: 48rem) {
      position: relative;
      top: 0;
      left: 0;
      width: auto;
      height: auto;
      padding: 0rem;
      margin-left: auto;
      background: none;
      box-shadow: none;
      transition: none;

      &-inner {
         display: flex;
         flex-direction: row;
         column-gap: 2rem;
         margin: 0 auto;
      }

      &-link {
         text-transform: capitalize;
      }
   }
}

.burger {
   position: relative;
   display: block;
   cursor: pointer;
   user-select: none;
   order: -1;
   z-index: 12;
   width: 1.6rem;
   height: 1.15rem;
   margin-right: 1.25rem;
   border: none;
   outline: none;
   background: none;
   visibility: visible;
   transform: rotate(0deg);
   transition: 0.35s ease;

   @media only screen and (min-width: 48rem) {
      display: none;
      visibility: hidden;
   }

   &-line {
      position: absolute;
      display: block;
      left: 0;
      width: 100%;
      height: 2px;
      border: none;
      outline: none;
      opacity: 1;
      border-radius: 1rem;
      transform: rotate(0deg);
      background-color: var(--color-black-300);
      transition: 0.25s ease-in-out;

      .darkmode & {
         background-color: var(--color-white-100);
      }

      &:nth-child(1) {
         top: 0px;
      }
      &:nth-child(2) {
         top: 0.5rem;
         width: 70%;
      }
      &:nth-child(3) {
         top: 1rem;
      }
   }

   &.is-active .burger-line {
      &:nth-child(1) {
         top: 0.5rem;
         transform: rotate(135deg);
      }
      &:nth-child(2) {
         opacity: 0;
         visibility: hidden;
      }
      &:nth-child(3) {
         top: 0.5rem;
         transform: rotate(-135deg);
      }
   }
}

.switch {
   position: relative;
   display: block;
   cursor: pointer;
   user-select: none;
   z-index: 9;
   margin-left: 5rem;
   margin-right: 0.5rem;

   &-light,
   &-dark {
      position: absolute;
      top: 50%;
      left: 50%;
      transform-origin: center;
      transform: translate(-50%, -50%);
      transition: all 0.3s ease-in;
   }

   &-light {
      font-size: 1.45rem;
      visibility: visible;
      color: var(--color-black-300);

      .darkmode & {
         font-size: 0rem;
         visibility: hidden;
      }
   }

   &-dark {
      font-size: 0rem;
      visibility: hidden;
      color: var(--color-white-100);

      .darkmode & {
         font-size: 1.45rem;
         visibility: visible;
      }
   }
}

// Banners
.banner {
   &-column {
      position: relative;
      display: grid;
      align-items: center;
      row-gap: 2rem;

      // Responsive Media Query
      @media only screen and (min-width: 48rem) {
         grid-template-columns: repeat(2, minmax(0, 1fr));
         justify-content: center;
         margin-top: 4rem;
      }

      @media only screen and (min-width: 64rem) {
         grid-template-columns: 1fr max-content;
         column-gap: 2rem;
      }
   }

   &-image {
      display: block;
      max-width: 25rem;
      height: auto;
      object-fit: cover;
      justify-self: center;

      // Responsive Media Query
      @media only screen and (min-width: 48rem) {
         order: 1;
         max-width: 28rem;
         height: auto;
      }

      @media only screen and (min-width: 64rem) {
         max-width: 33rem;
         height: auto;
      }
   }

   &-inner {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      row-gap: 1.5rem;
   }
}
!

JS 

              
                const navbarMenu = document.getElementById("menu");
const burgerMenu = document.getElementById("burger");
const headerMenu = document.getElementById("header");
const overlayMenu = document.querySelector(".overlay");

// Open Close Navbar Menu on Click Burger
if (burgerMenu && navbarMenu) {
   burgerMenu.addEventListener("click", () => {
      burgerMenu.classList.toggle("is-active");
      navbarMenu.classList.toggle("is-active");
   });
}

// Close Navbar Menu on Click Links
document.querySelectorAll(".menu-link").forEach((link) => {
   link.addEventListener("click", () => {
      burgerMenu.classList.remove("is-active");
      navbarMenu.classList.remove("is-active");
   });
});

// Fixed Navbar Menu on Window Resize
window.addEventListener("resize", () => {
   if (window.innerWidth >= 992) {
      if (navbarMenu.classList.contains("is-active")) {
         navbarMenu.classList.remove("is-active");
         overlayMenu.classList.remove("is-active");
      }
   }
});

// Dark and Light Mode on Switch Click
document.addEventListener("DOMContentLoaded", () => {
   const darkSwitch = document.getElementById("switch");

   darkSwitch.addEventListener("click", () => {
      document.documentElement.classList.toggle("darkmode");
      document.body.classList.toggle("darkmode");
   });
});
!
999px

Console