diff --git a/100_projects/85-responsive-404-page-not-found/assets/css/styles.css b/100_projects/85-responsive-404-page-not-found/assets/css/styles.css
new file mode 100644
index 0000000..cf2d2ce
--- /dev/null
+++ b/100_projects/85-responsive-404-page-not-found/assets/css/styles.css
@@ -0,0 +1,241 @@
+/*=============== GOOGLE FONTS ===============*/
+@import url("https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;700&display=swap");
+:root {
+  --header-height: 3.5rem;
+  --first-color: #d5cabd;
+  --text-color: #2f4858;
+  --body-font: 'Space Grotesk', sans-serif;
+  --biggest-font-size: 2.375rem;
+  --normal-font-size: .938rem;
+  --smaller-font-size: .75rem;
+}
+@media screen and (min-width: 1024px) {
+  :root {
+    --biggest-font-size: 5rem;
+    --normal-font-size: 1rem;
+    --smaller-font-size: .813rem;
+  }
+}
+* {
+  box-sizing: border-box;
+  padding: 0;
+  margin: 0;
+}
+body {
+  font-family: var(--body-font);
+  font-size: var(--normal-font-size);
+  font-weight: 500;
+  color: var(--text-color);
+}
+ul {
+  list-style: none;
+}
+a {
+  text-decoration: none;
+}
+img {
+  max-width: 100%;
+  height: auto;
+}
+.container {
+  max-width: 1024px;
+  margin-left: 1.5rem;
+  margin-right: 1.5rem;
+}
+.main {
+  overflow: hidden; /* For the animations ScrollReveal */
+}
+.header {
+  position: fixed;
+  width: 100%;
+  background-color: transparent;
+  top: 0;
+  left: 0;
+  z-index: 100;
+}
+.nav {
+  height: var(--header-height);
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+}
+.nav__logo, 
+.nav__toggle {
+  color: var(--text-color);
+  display: inline-flex;
+}
+.nav__logo {
+  font-weight: 700;
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  gap: 5px;
+  font-size: 21px;
+  transition: .3s;
+}
+.nav__logo:hover{
+  color:#fff;
+}
+.nav__toggle {
+  font-size: 1.25rem;
+  cursor: pointer;
+}
+@media screen and (max-width: 767px) {
+  .nav__menu {
+    position: fixed;
+    background-color: var(--first-color);
+    left: 0;
+    top: -100%;
+    width: 100%;
+    padding: 5rem 0 4rem;
+    border-radius: 0 0 1.5rem 1.5rem;
+    box-shadow: 0 2px 4px hsla(38, 4%, 15%, .15);
+    transition: .4s;
+  }
+}
+.nav__list {
+  text-align: center;
+  display: flex;
+  flex-direction: column;
+  row-gap: 2rem;
+}
+.nav__link {
+  color: var(--text-color);
+}
+.nav__close {
+  position: absolute;
+  top: 1rem;
+  right: 1.5rem;
+  font-size: 1.5rem;
+  color: var(--text-color);
+  cursor: pointer;
+}
+.show-menu {
+  top: 0;
+}
+.home {
+  background-color: var(--first-color);
+  padding: 9rem 0 2rem;
+  height: 100vh;
+  display: grid;
+}
+.home__container {
+  display: grid;
+  align-content: center;
+  row-gap: 2.5rem;
+}
+.home__data {
+  text-align: center;
+}
+.home__title {
+  font-size: var(--biggest-font-size);
+  margin: .75rem 0;
+}
+.home__button {
+  margin-top: 2rem;
+  display: inline-block;
+  background-color: var(--text-color);
+  color: #fff;
+  padding: .80rem 1.5rem;
+  border-radius: 3rem;
+  transition: .4s;
+}
+.home__button:hover {
+  box-shadow: 0 4px 12px hsla(38, 69%, 8%, .2);
+}
+.home__img img {
+  width: 230px;
+  animation: floaty 1.8s infinite alternate;
+}
+.home__img {
+  justify-self: center;
+}
+.home__shadow {
+  width: 130px;
+  height: 24px;
+  background-color: hsla(38, 21%, 19%, .16);
+  margin: 0 auto;
+  border-radius: 50%;
+  filter: blur(7px);
+  animation: shadow 1.8s infinite alternate;
+}
+.home__footer {
+  display: flex;
+  justify-content: center;
+  column-gap: .5rem;
+  font-size: var(--smaller-font-size);
+  align-self: flex-end;
+}
+@keyframes floaty {
+  0% {
+    transform: translateY(0);
+  }
+  100% {
+    transform: translateY(15px);
+  }
+}
+
+@keyframes shadow {
+  0% {
+    transform: scale(1, 1);
+  }
+  100% {
+    transform: scale(.85, .85);
+  }
+}
+@media screen and (max-width: 320px) {
+  .home {
+    padding-top: 7rem;
+  }
+}
+@media screen and (min-width: 767px) {
+  .nav {
+    height: calc(var(--header-height) + 1.5rem);
+  }
+  .nav__toggle, 
+  .nav__close {
+    display: none;
+  }
+  .nav__list {
+    flex-direction: row;
+    column-gap: 3.5rem;
+  }
+}
+@media screen and (min-width: 1024px) {
+  .home__container {
+    grid-template-columns: repeat(2, 1fr);
+    align-items: center;
+    column-gap: 2rem;
+  }
+  .home__data {
+    text-align: initial;
+  }
+  .home__img img {
+    width: 400px;
+  }
+  .home__shadow {
+    width: 250px;
+    height: 40px;
+  }
+}
+@media screen and (min-width: 1048px) {
+  .container {
+    margin-left: auto;
+    margin-right: auto;
+  }
+}
+@media screen and (min-width: 2048px) {
+  body {
+    zoom: 1.7;
+  }
+
+  .home {
+    height: initial;
+    row-gap: 4rem;
+  }
+}
+@media screen and (min-width: 3840px) {
+  body {
+    zoom: 3.1;
+  }
+}
\ No newline at end of file
diff --git a/100_projects/85-responsive-404-page-not-found/assets/img/ghost-img.png b/100_projects/85-responsive-404-page-not-found/assets/img/ghost-img.png
new file mode 100644
index 0000000..1261dc1
Binary files /dev/null and b/100_projects/85-responsive-404-page-not-found/assets/img/ghost-img.png differ
diff --git a/100_projects/85-responsive-404-page-not-found/assets/js/main.js b/100_projects/85-responsive-404-page-not-found/assets/js/main.js
new file mode 100644
index 0000000..e968e49
--- /dev/null
+++ b/100_projects/85-responsive-404-page-not-found/assets/js/main.js
@@ -0,0 +1,37 @@
+/*=============== SHOW MENU ===============*/
+const navMenu = document.getElementById('nav-menu'),
+      navToggle = document.getElementById('nav-toggle'),
+      navClose = document.getElementById('nav-close')
+
+/*MENU SHOW*/
+if(navToggle){
+    navToggle.addEventListener('click', () =>{
+        navMenu.classList.add('show-menu')
+    })
+}
+
+/*MENU HIDDEN */
+if(navClose){
+    navClose.addEventListener('click', () =>{
+        navMenu.classList.remove('show-menu')
+    })
+}
+
+/*REMOVE MENU MOBILE*/
+const navLink = document.querySelectorAll('.nav__link')
+
+function linkAction(){
+    const navMenu = document.getElementById('nav-menu')
+    // When we click on each nav__link, we remove the show-menu class
+    navMenu.classList.remove('show-menu')
+}
+navLink.forEach(n => n.addEventListener('click', linkAction))
+
+/*SCROLL REVEAL ANIMATION*/
+const sr = ScrollReveal({
+    distance: '90px',
+    duration: 3000,
+})
+sr.reveal(`.home__data`, {origin: 'top', delay: 400})
+sr.reveal(`.home__img`, {origin: 'bottom', delay: 600})
+sr.reveal(`.home__footer`, {origin: 'bottom', delay: 800})
\ No newline at end of file
diff --git a/100_projects/85-responsive-404-page-not-found/assets/js/scrollreveal.min.js b/100_projects/85-responsive-404-page-not-found/assets/js/scrollreveal.min.js
new file mode 100644
index 0000000..5428bbd
--- /dev/null
+++ b/100_projects/85-responsive-404-page-not-found/assets/js/scrollreveal.min.js
@@ -0,0 +1,12 @@
+/*! @license ScrollReveal v4.0.9
+
+	Copyright 2021 Fisssion LLC.
+
+	Licensed under the GNU General Public License 3.0 for
+	compatible open source projects and non-commercial use.
+
+	For commercial sites, themes, projects, and applications,
+	keep your source code private/proprietary by purchasing
+	a commercial license from https://scrollrevealjs.org/
+*/
+var ScrollReveal=function(){"use strict";var r={delay:0,distance:"0",duration:600,easing:"cubic-bezier(0.5, 0, 0, 1)",interval:0,opacity:0,origin:"bottom",rotate:{x:0,y:0,z:0},scale:1,cleanup:!1,container:document.documentElement,desktop:!0,mobile:!0,reset:!1,useDelay:"always",viewFactor:0,viewOffset:{top:0,right:0,bottom:0,left:0},afterReset:function(){},afterReveal:function(){},beforeReset:function(){},beforeReveal:function(){}};var n={success:function(){document.documentElement.classList.add("sr"),document.body?document.body.style.height="100%":document.addEventListener("DOMContentLoaded",function(){document.body.style.height="100%"})},failure:function(){return document.documentElement.classList.remove("sr"),{clean:function(){},destroy:function(){},reveal:function(){},sync:function(){},get noop(){return!0}}}};function o(e){return"object"==typeof window.Node?e instanceof window.Node:null!==e&&"object"==typeof e&&"number"==typeof e.nodeType&&"string"==typeof e.nodeName}function 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diff --git a/100_projects/85-responsive-404-page-not-found/index.html b/100_projects/85-responsive-404-page-not-found/index.html
new file mode 100644
index 0000000..2533175
--- /dev/null
+++ b/100_projects/85-responsive-404-page-not-found/index.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html>
+    <html lang="en">
+    <head>
+        <meta charset="UTF-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1.0">
+        <link href='https://unpkg.com/boxicons@2.1.2/css/boxicons.min.css' rel='stylesheet'>
+        <link rel="stylesheet" href="assets/css/styles.css">
+        <title>Document</title>
+    </head>
+    <body>
+        <header class="header">
+            <nav class="nav container">
+                <a href="#" class="nav__logo">
+                    <i class='bx bxs-ghost'></i>Ghost
+                </a>
+                <div class="nav__menu" id="nav-menu">
+                    <ul class="nav__list">
+                        <li class="nav__item">
+                            <a href="#" class="nav__link">Home</a>
+                        </li>
+                        <li class="nav__item">
+                            <a href="#" class="nav__link">About</a>
+                        </li>
+                        <li class="nav__item">
+                            <a href="#" class="nav__link">Help</a>
+                        </li>
+                        <li class="nav__item">
+                            <a href="#" class="nav__link">Contact</a>
+                        </li>
+                    </ul>
+
+                    <div class="nav__close" id="nav-close">
+                        <i class='bx bx-x'></i>
+                    </div>
+                </div>
+                <div class="nav__toggle" id="nav-toggle">
+                    <i class='bx bx-grid-alt'></i>
+                </div>
+            </nav>
+        </header>
+        <main class="main">
+            <section class="home">
+                <div class="home__container container">
+                    <div class="home__data">
+                        <span class="home__subtitle">Error 404</span>
+                        <h1 class="home__title">Hey Buddy</h1>
+                        <p class="home__description">
+                            We can't seem to find the page <br> you are looking for.
+                        </p>
+                        <a href="#" class="home__button">
+                            Go Home
+                        </a>
+                    </div>
+
+                    <div class="home__img">
+                        <img src="assets/img/ghost-img.png" alt="">
+                        <div class="home__shadow"></div>
+                    </div>
+                </div>
+                <footer class="home__footer">
+                    <span>(554) 987-654</span>
+                    <span>|</span>
+                    <span>info@company.com</span>
+                </footer>
+            </section>
+        </main>
+        <script src="assets/js/scrollreveal.min.js"></script>
+        <script src="assets/js/main.js"></script>
+    </body>
+</html>
\ No newline at end of file