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About the <head>

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CSS

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JavaScript

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HTML 

              
                <!-- images by https://placeimg.com/ -->

<body>
  <nav>
    <ul>
      <li><a href="#home">home</a></li>
      <li><a href="#about">about</a></li>
      <li><a href="#portfolio">portfolio</a></li>
      <li><a href="#contact">contact</a></li>
    </ul>
  </nav>

  <div class="container-all">
    <div class="welcome" id="home">
      <div id="particles"></div>
      <button class="menu-button">
          <svg class="hamburger" x="0px" y="0px"
          viewBox="0 0 30 17" height="17" width="30" >
            <g transform="translate(-15 -15)">
              <rect x="15" y="16" class="st0" width="30" height="2"/>
            </g>
            <g transform="translate(-15 -9)">
              <rect x="15" y="16" class="st0" width="30" height="2"/>
            </g>
            <g transform="translate(-15 -3)">
              <rect x="15" y="16" class="st0" width="30" height="2"/>
            </g>
          </svg>
          <svg class="close-icon" x="0px" y="0px"
          viewBox="0 0 30 17" height="17" width="30">
       <g transform="translate(-15 -15)">
         <polygon class="st0" points="31.2,23.5 37,29.3 35.8,30.5 30,24.7 24.2,30.5 23,29.3 28.8,23.5 23,17.7 24.2,16.5 30,22.3 
           35.8,16.5 37,17.7 	"/>
       </g>
       </svg>      
      </button>

      <h1>Welcome to my<span>Portfolio</span></h1>
    </div>

    <section class="intro">
      <div class="intro-left">
        <img src="https://placeimg.com/640/480/tech" alt="random image">
      </div>
      <div class="intro-middle">
        <h2>Making it happen</h2>
        <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. In sit amet eleifend justo. Quisque non magna vel justo eleifend imperdiet</p>
      </div>
      <div class="intro-right">
        <img src="https://placeimg.com/640/480/tech/sepia" alt="random image">
      </div>
    </section>

    <section class="about-me" id="about">

      <h1 class="about-title">Joe Portfolio</h1>
      <h2 class="about-subtitle">Designer & Developer</h2>
      <div class="about-text">
        <p>Aenean mattis tristique elementum. Duis massa tellus, tempus non fermentum at, venenatis et augue. Phasellus tristique purus sed sagittis interdum. Duis luctus sapien justo, vel viverra ex convallis et. Maecenas suscipit lacus ut lectus mattis
          ornare. Vestibulum faucibus purus sit amet erat lobortis, tristique fringilla leo sodales. Interdum et malesuada fames ac ante.</p>
        <p>Aenean mattis tristique elementum. Duis massa tellus, tempus non fermentum at, venenatis et augue. Phasellus tristique purus sed sagittis interdum. Duis luctus sapien justo, vel viverra ex convallis et. Maecenas suscipit lacus ut lectus mattis
          ornare. Vestibulum faucibus purus sit amet erat lobortis, tristique fringilla leo sodales. Interdum et malesuada fames ac ante.</p>
      </div>
    </section>

    <section class="portfolio" id="portfolio">
      <h1 class="white">My Work </h1>
      <div class="portfolio-items">

        <!-- Portfolio item 1 -->
        <figure class="portfolio-item">
          <img class="portfolio-image" src="https://placeimg.com/640/480/tech/sepia" alt="portfolio item">
          <figcaption>
            <h2 class="portfolio-title">Project Name</h2>
            <p class="portfolio-desc">A short description could go right here</p>
            <a href="#" class="portfolio-link">More info</a>
          </figcaption>

          <!-- Portfolio modal 1 -->
          <div class="portfolio-modal">
            <button class="modal-close">
              <svg x="0px" y="0px"
                viewBox="0 0 30 17" height="17" width="30">
                <g transform="translate(-15 -15)">
                <polygon class="st0" points="31.2,23.5 37,29.3 35.8,30.5 30,24.7 24.2,30.5 23,29.3 28.8,23.5 23,17.7 24.2,16.5 30,22.3 
                35.8,16.5 37,17.7 	"/>
                </g>
            </svg>
           </button>
            <div class="portfolio-header header-one">
              <div class="portfolio-title-box">
                <h2 class="portfolio-title">Project Name</h2>
                <p class="portfolio-subtitle">Subtitle goes here</p>
              </div>
            </div>
            <!-- / portfolio-header -->
            <div class="portfolio-content">
              <p>Aenean mattis tristique elementum. Duis massa tellus, tempus non fermentum at, venenatis et augue. Phasellus tristique purus sed sagittis interdum. Duis luctus sapien justo, vel viverra ex convallis et. Maecenas suscipit lacus ut lectus
                mattis ornare. Vestibulum faucibus purus sit amet erat lobortis, tristique fringilla leo sodales. Interdum et malesuada fames ac ante.</p>
              <img class="portfolio-full-width" src="https://placeimg.com/640/480/tech/sepia" alt="an image">
              <p>Aenean mattis tristique elementum. Duis massa tellus, tempus non fermentum at, venenatis et augue. Phasellus tristique purus sed sagittis interdum. Duis luctus sapien justo, vel viverra ex convallis et. Maecenas suscipit lacus ut lectus
                mattis ornare. Vestibulum faucibus purus sit amet erat lobortis, tristique fringilla leo sodales. Interdum et malesuada fames ac ante.</p>
              <p>Aenean mattis tristique elementum. Duis massa tellus, tempus non fermentum at, venenatis et augue. Phasellus tristique purus sed sagittis interdum. Duis luctus sapien justo, vel viverra ex convallis et. Maecenas suscipit lacus ut lectus
                mattis ornare. Vestibulum faucibus purus sit amet erat lobortis, tristique fringilla leo sodales. Interdum et malesuada fames ac ante.</p>
              <img class="portfolio-pull-left" src="https://placeimg.com/640/480/tech/sepia" alt="an image">
              <p>Aenean mattis tristique elementum. Duis massa tellus, tempus non fermentum at, venenatis et augue. Phasellus tristique purus sed sagittis interdum. Duis luctus sapien justo, vel viverra ex convallis et. Maecenas suscipit lacus ut lectus
                mattis ornare. Vestibulum faucibus purus sit amet erat lobortis, tristique fringilla leo sodales. Interdum et malesuada fames ac ante.</p>
              <p>Aenean mattis tristique elementum. Duis massa tellus, tempus non fermentum at, venenatis et augue. Phasellus tristique purus sed sagittis interdum. Duis luctus sapien justo, vel viverra ex convallis et. Maecenas suscipit lacus ut lectus
                mattis ornare. Vestibulum faucibus purus sit amet erat lobortis, tristique fringilla leo sodales. Interdum et malesuada fames ac ante.</p>
              <img class="portfolio-pull-right" src="https://placeimg.com/640/480/tech/sepia" alt="an image">
            </div>
          </div>
          <!-- /modal -->
        </figure>

        <!-- Portfolio item 2 -->
        <figure class="portfolio-item">
          <img class="portfolio-image" src="https://placeimg.com/640/480/people/grayscale" alt="portfolio item">
          <figcaption>
            <h2 class="portfolio-title">Project Name</h2>
            <p class="portfolio-desc">A short description could go right here</p>
            <a href="#" class="portfolio-link">More info</a>
          </figcaption>
          <div class="portfolio-modal">
            <button class="modal-close">
                  <svg x="0px" y="0px"
                    viewBox="0 0 30 17" height="17" width="30">
                    <g transform="translate(-15 -15)">
                    <polygon class="st0" points="31.2,23.5 37,29.3 35.8,30.5 30,24.7 24.2,30.5 23,29.3 28.8,23.5 23,17.7 24.2,16.5 30,22.3 
                    35.8,16.5 37,17.7 	"/>
                    </g>
                </svg>
               </button>
            <div class="portfolio-header header-two">
              <div class="portfolio-title-box">
                <h2 class="portfolio-title">Project Name 2</h2>
                <p class="portfolio-subtitle">Subtitle goes here</p>
              </div>
            </div>
            <!-- / portfolio-header -->
            <div class="portfolio-content">
              <p>Aenean mattis tristique elementum. Duis massa tellus, tempus non fermentum at, venenatis et augue. Phasellus tristique purus sed sagittis interdum. Duis luctus sapien justo, vel viverra ex convallis et. Maecenas suscipit lacus ut lectus
                mattis ornare. Vestibulum faucibus purus sit amet erat lobortis, tristique fringilla leo sodales. Interdum et malesuada fames ac ante.</p>
              <img class="portfolio-full-width" src="https://placeimg.com/640/480/people/grayscale" alt="an image">
              <p>Aenean mattis tristique elementum. Duis massa tellus, tempus non fermentum at, venenatis et augue. Phasellus tristique purus sed sagittis interdum. Duis luctus sapien justo, vel viverra ex convallis et. Maecenas suscipit lacus ut lectus
                mattis ornare. Vestibulum faucibus purus sit amet erat lobortis, tristique fringilla leo sodales. Interdum et malesuada fames ac ante.</p>
              <p>Aenean mattis tristique elementum. Duis massa tellus, tempus non fermentum at, venenatis et augue. Phasellus tristique purus sed sagittis interdum. Duis luctus sapien justo, vel viverra ex convallis et. Maecenas suscipit lacus ut lectus
                mattis ornare. Vestibulum faucibus purus sit amet erat lobortis, tristique fringilla leo sodales. Interdum et malesuada fames ac ante.</p>
              <img class="portfolio-pull-left" src="https://placeimg.com/640/480/people/grayscale" alt="an image">
              <p>Aenean mattis tristique elementum. Duis massa tellus, tempus non fermentum at, venenatis et augue. Phasellus tristique purus sed sagittis interdum. Duis luctus sapien justo, vel viverra ex convallis et. Maecenas suscipit lacus ut lectus
                mattis ornare. Vestibulum faucibus purus sit amet erat lobortis, tristique fringilla leo sodales. Interdum et malesuada fames ac ante.</p>
              <p>Aenean mattis tristique elementum. Duis massa tellus, tempus non fermentum at, venenatis et augue. Phasellus tristique purus sed sagittis interdum. Duis luctus sapien justo, vel viverra ex convallis et. Maecenas suscipit lacus ut lectus
                mattis ornare. Vestibulum faucibus purus sit amet erat lobortis, tristique fringilla leo sodales. Interdum et malesuada fames ac ante.</p>
              <img class="portfolio-pull-right" src="https://placeimg.com/640/480/people/grayscale" alt="an image">
            </div>
          </div>
        </figure>

        <!-- Portfolio item 3 -->
        <figure class="portfolio-item">
          <img class="portfolio-image" src="https://placeimg.com/640/480/arch" alt="portfolio item">
          <figcaption>
            <h2 class="portfolio-title">Project Name</h2>
            <p class="portfolio-desc">A short description could go right here</p>
            <a href="#" class="portfolio-link">More info</a>
          </figcaption>
        </figure>

        <!-- Portfolio item 4 -->
        <figure class="portfolio-item">
          <img class="portfolio-image" src="https://placeimg.com/640/480/tech" alt="portfolio item">
          <figcaption>
            <h2 class="portfolio-title">Project Name</h2>
            <p class="portfolio-desc">A short description could go right here</p>
            <a href="#" class="portfolio-link">More info</a>
          </figcaption>
        </figure>

        <!-- Portfolio item 5 -->
        <figure class="portfolio-item featured">
          <img class="portfolio-image" src="https://placeimg.com/640/480/tech/grayscale" alt="portfolio item">
          <figcaption>
            <h2 class="portfolio-title">Project Name</h2>
            <p class="portfolio-desc">A short description could go right here</p>
            <a href="#" class="portfolio-link">More info</a>
          </figcaption>
        </figure>

      </div>

    </section>

    <section class="contact" id="contact">
      <h1>Contact me</h1>
      <form action="">
        <label class="name" class="name">Name:
            <input type="text" id="name">
        </label>

        <label class="email" class="email">Email:
          <input type="email" id="email">
        </label>

        <label message="message" class="message">Message:
          <textarea name="" id="message"></textarea>
        </label>

        <input class="button form-button" type="submit" value="SEND">

      </form>
    </section>

    <footer>
      <p>Follow me on social media</p>
      <div class="social-icons">
        <div class="social-icon fa fa-twitter"></div>
        <div class="social-icon fa fa-linkedin"></div>
        <div class="social-icon fa fa-github"></div>
      </div>

      <p class="copyright">Pasteleft 2049 Joe</p>
    </footer>
  </div>

</body>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css?family=Merriweather:400,900|Six+Caps");

/* base */
body {
  color: #a7a7a7;
  font-family: "Merriweather", serif;
  line-height: 1.6;
  background: #ffffff;
  font-size: 0.875rem;
  overflow-x: hidden;
}
@media (min-width: 50em) {
  body {
    font-size: 1.125rem;
  }
}

img {
  max-width: 100%;
}

h1,
h2,
p {
  margin-top: 0;
  margin-bottom: 1em;
}

h1 {
  color: #03afc2;
  line-height: 1;
  font-size: 3.125rem;
}
@media (min-width: 50em) {
  h1 {
    font-size: 4.25rem;
  }
}

h2 {
  font-size: 2rem;
  letter-spacing: 0.15em;
  color: #606060;
  text-transform: uppercase;
  line-height: 1;
  font-family: "Six Caps", sans-serif;
  font-weight: 400;
}
@media (min-width: 50em) {
  h2 {
    font-size: 3rem;
  }
}

/* navigation */
.menu-button {
  position: absolute;
  top: 3em;
  left: 3em;
  background: transparent;
  border: 0;
  transition: transform ease-in-out 250ms;
  cursor: pointer;
  outline: none;
}

nav {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 20%;
  z-index: 10;
  transform: translateX(-100%);
  transition: transform ease-out 250ms;
}

nav li,
nav a {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  width: 100%;
}

nav ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: flex;
  flex-direction: column;
  height: 100vh;
  justify-content: space-around;
  align-items: stretch;
  background: #03afc2;
}

nav li {
  text-align: center;
}
nav li:not(:last-of-type) {
  border-bottom: 1px solid #223843;
}

nav li:hover {
  background: rgba(0, 0, 0, 0.2);
}

nav a {
  font-size: 4rem;
  letter-spacing: 0.15em;
  color: #223843;
  text-transform: uppercase;
  line-height: 1;
  font-family: "Six Caps", sans-serif;
  font-weight: 400;
  text-decoration: none;
}

.close-icon {
  display: none;
}

.nav-is-open nav {
  transform: translateX(0);
}

.nav-is-open .container-all {
  transform: translateX(80%);
}

.nav-is-open .hamburger {
  display: none;
}

.nav-is-open .close-icon {
  display: block;
}

.nav-is-open .menu-button {
  transform: translateX(-70%);
}

.container-all {
  transition: transform ease-out 250ms;
  transition: transform ease-out 250ms, -webkit-transform ease-out 250ms;
}

/* home */

.welcome {
  background-image: url(../img/header-bg.png);
  background-size: cover;
  background-position: center;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}
.welcome h1 {
  font-size: 1.5rem;
  font-weight: 400;
  color: #223843;
  line-height: 2;
  text-align: center;
}
@media (min-width: 50em) {
  .welcome h1 {
    font-size: 3vw;
  }
}
.welcome h1 span {
  font-size: 5.5rem;
  letter-spacing: 0.15em;
  color: #03afc2;
  text-transform: uppercase;
  line-height: 1;
  font-family: "Six Caps", sans-serif;
  font-weight: 400;
  display: block;
}
@media (min-width: 50em) {
  .welcome h1 span {
    font-size: 10vw;
  }
}
.welcome h1::before,
.welcome h1::after {
  content: "";
  display: block;
  width: 60%;
  height: 1px;
  background: #223843;
}
.welcome h1::before {
  margin: 0 auto 2em;
}
.welcome h1::after {
  margin: 2em auto 0;
}

.intro {
  display: flex;
  color: rgba(255, 255, 255, 0.7);
}
.intro h2 {
  color: #ffffff;
}
.intro h2::after {
  content: "";
  width: 20%;
  height: 1px;
  background: rgba(255, 255, 255, 0.5);
  display: block;
  margin: 1em auto 0;
}
@supports (display: grid) {
  .intro {
    display: grid;
    grid-template-columns: minmax(4em, 1fr) minmax(auto, 30em) minmax(4em, 1fr);
  }
}

.intro-middle {
  background: #223843;
  padding: 2.5em 5vw;
  text-align: center;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.intro-left img,
.intro-right img {
  object-fit: cover;
  min-height: 100%;
  min-width: 100%;
  display: block;
}

/* About */
.about-me {
  width: 90%;
  margin: 0 auto;
  max-width: 50em;
  margin-top: 5em;
  margin-bottom: 5em;
}
.about-me::after {
  content: "";
  display: block;
  clear: both;
}

.about-img {
  max-height: 25em;
}
@media (min-width: 42em) {
  .about-img {
    float: left;
    margin-right: 1em;
  }
}

.about-title {
  margin-bottom: 0.25em;
}

.about-subtitle {
  margin: 0.5em 0;
}

@supports (display: grid) {
  .about-me {
    display: grid;
    grid-template-columns: [port-start] minmax(6em, 1fr) [name-start] minmax(
        6em,
        1fr
      ) [img-end] 2fr [port-end];
    grid-column-gap: 0.5em;
  }
  .about-img {
    grid-column: port / img;
    grid-row: 1 / 2;
  }
  @media (min-width: 50em) {
    .about-img {
      grid-row: 1 / 4;
    }
  }
  .about-title {
    grid-column: name / port;
    grid-row: 1 / 2;
    align-self: end;
  }
  .about-subtitle,
  .about-text {
    grid-column: port / port;
  }
  @media (min-width: 50em) {
    .about-subtitle,
    .about-text {
      grid-column: image-end / port-end;
    }
  }
  .about-subtitle {
    grid-row: 2 / 3;
  }
  .about-text {
    grid-row: 3 / 4;
  }
}

/* Portfolio  */
.portfolio {
  text-align: center;
  background: #223843; /* #e8e9eb;*/
  padding: 5em 0;
}

.portfolio-items {
  display: flex;
  flex-wrap: wrap;
  width: 90%;
  margin: 0 auto;
  max-width: 75em;
}

.portfolio-item {
  position: relative;
  overflow: hidden;
  flex: 1 1 20rem;
}
.portfolio-item .portfolio-image {
  display: block;
  width: 100%;
}
.portfolio-item figcaption {
  position: absolute;
  top: 100%;
  bottom: 0;
  right: 0;
  left: 0;
  padding: 1em;
  background: rgba(3, 175, 194, 0.75);
  color: #ffffff;
  text-align: left;
  display: flex;
  flex-direction: column;
  transition: top ease-in-out 0.65s;
}
.portfolio-item:hover figcaption,
.portfolio-item:focus figcaption {
  top: 0;
}

.portfolio-title {
  color: #ffffff;
  font-size: 1.5rem;
  margin-bottom: auto;
}
@media (min-width:42em){
  .portfolio-title{
  font-size: 2.5rem;
    }
}

.portfolio-desc {
  display: none;
}

.portfolio-link {
  color: white;
  font-weight: 900;
  font-size: .7rem;
  text-decoration: none;
  border-bottom: 3px solid #ffffff;
  align-self: flex-start;
}
@media (min-width:42em){
  .portfolio-link{
  font-size: 1.1rem;
    }
}
.portfolio-link::after {
  content: url(../img/arrow-white.svg);
  display: inline-block;
  height: 0.8em;
  width: 0.8em;
  margin-left: 0.5em;
}

@supports (display: grid) {
  .portfolio-items {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
  }
  @media (min-width: 50em) {
    .portfolio-items {
      grid-template-columns: repeat(4, 1fr);
    }
  }
  .portfolio-item.featured {
    grid-column: 1 / span 2;
    grid-row: 1 / span 2;
  }
  .featured .portfolio-title {
    font-size: 5rem;
  }
  .featured .portfolio-desc {
    display: block;
  }
}

.portfolio-modal {
  position: fixed;
  z-index: 10;
  top: 2em;
  bottom: 2em;
  left: 2em;
  right: 2em;
  background: white;
  box-shadow: 0 0 0 3em rgba(0, 0, 0, 0.5);
  overflow-y: scroll;
  overflow-x: hidden;
  display: none;
}
.portfolio-modal.is-open {
  display: block;
}

.modal-close {
  background: white;
  position: fixed;
  left: 1em;
  top: 1em;
  border: 0;
  width: 2em;
  height: 2em;
  padding: 4px 0 0;
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.5);
}

.portfolio-header {
  text-align: left;
  padding: 5em 0;
  margin-bottom: 2em;
  background-size: cover;
  background-position: center;
}

.header-one {
  background-image: url(https://placeimg.com/640/480/tech);
}

.header-two {
  background-image: url(https://placeimg.com/640/480/tech);
}

.portfolio-title-box {
  background: rgba(3, 175, 194, 0.75);
  padding: 3em 0 3em 3em;
  color: white;
  width: 70%;
}
.portfolio-title-box .portfolio-title {
  font-size: 3.5rem;
  display: inline-block;
}
.portfolio-title-box .portfolio-title::after {
  content: "";
  display: block;
  height: 1px;
  margin: 0.5em 0;
  background: white;
  width: 100%;
}

.portfolio-subtitle {
  font-size: 1rem;
}

.portfolio-content {
  text-align: left;
  width: 85%;
  margin: 0 auto;
  padding-bottom: 2em;
}

.portfolio-full-width {
  width: 100vw;
  max-width: initial;
  margin: 2em calc(50% - 50vw);
  height: 20vh;
  object-fit: cover;
}

@media (min-width: 50em) {
  .portfolio-pull-left {
    width: 65%;
    float: left;
    margin-right: 2em;
  }
  .portfolio-pull-right {
    width: 65%;
    float: right;
    margin-left: 2em;
  }
}

@keyframes modalIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@keyframes modalOut {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

/* Contact  */
.contact {
  width: 90%;
  margin: 0 auto;
  max-width: 50em;
  padding: 5em 0;
}
.contact h1 {
  text-align: center;
}

form {
  display: flex;
  flex-direction: column;
}
@supports (display: grid) {
  @media (min-width: 50em) {
    form {
      display: grid;
      grid-template-columns: 50% 50%;
      grid-column-gap: 1em;

      grid-template-areas: "name     email" "message message" "   .      button";
    }

    form .name {
      grid-area: name;
    }
    form .email {
      grid-area: email;
    }
    form .message {
      grid-area: message;
    }
    form .message textarea {
      height: 10em;
    }
    form .button {
      grid-area: button;
    }
  }
}

label {
  display: block;
  margin-top: 1em;
  color: #606060;
}

input,
textarea {
  box-sizing: border-box;
  display: block;
  padding: 0.75em;
  width: 100%;
  min-width: 15em;
  background: #fbfbfc;
  border: 1px solid #e8e9eb;
  font-size: 1.2rem;
}

textarea {
  resize: vertical;
  outline: none;
}

.button {
  display: inline-block;
  width: auto;
  min-width: auto;
  margin-top: 1em;
  margin-left: auto;
  background: #03afc2;
  border: none;
  font-size: 2.5rem;
  letter-spacing: 0.15em;
  color: #ffffff;
  text-transform: uppercase;
  line-height: 1;
  font-family: "Six Caps", sans-serif;
  font-weight: 400;
  padding: 0.5em 1.5em;
}

/* Footer */
footer {
  background: #223843;
  padding: 5em 0;
  text-align: center;
}

.social-icons {
  width: 90%;
  margin: 0 auto;
  max-width: 15em;
  display: flex;
  justify-content: space-between;
  margin: 1.75em auto 4em;
}

.social-icon {
  font-size: 2em;
}
.social-icon:hover {
  color: white;
  transform: scale(1.1);
  transition: all 0.5s ease-in;
  cursor: pointer;
}

.copyright::before {
  content: "";
  display: block;
  height: 1px;
  background: rgba(255, 255, 255, 0.15);
  margin: 4em auto;
  width: 25%;
}

/* utility classes */
.white{
  color:white;
}

#particles {
  position: absolute;
  display: block;
  top: 0;
  left: 0;
  height: 100%;
  width:100%;
  z-index: -1;
}
!

JS 

              
                // Navigation
const navToggle = document.querySelector('.menu-button')
const nav = document.querySelector('nav')
const containerAll = document.querySelector('.container-all')

const containerAllStyle = containerAll.style
const bodyClassList = document.body.classList

navToggle.addEventListener('click', _ => {
  containerAllStyle.transition = 'transform 250ms ease-in-out'
  bodyClassList.toggle('nav-is-open')
})

nav.addEventListener('click', _ => {
  containerAllStyle.transition = '0ms'
  bodyClassList.remove('nav-is-open')
})



// modal
const portfolioContainer = document.querySelector('.portfolio-items')

portfolioContainer.addEventListener('click', e => {
  // console.log(e)
  e.preventDefault()

  const modalToggle = e.target.closest('.portfolio-link')
  // console.log(modalToggle)
  if (! modalToggle) return

  const modal = modalToggle.parentNode.nextElementSibling
  const closeButton = modal.querySelector('.modal-close')

  const modalOpen = _ => {
    modal.classList.add('is-open')
    modal.style.animation = 'modalIn 500ms forwards'
    //document.body.style.overflowY = 'hidden'
  }

  const modalClose = _ => {
    modal.classList.remove('is-open')
    modal.removeEventListener('animationend', modalClose)
  }

  closeButton.addEventListener('click', _ => {
    modal.style.animation = 'modalOut 500ms forwards'
    modal.addEventListener('animationend', modalClose)
    //document.body.style.overflowY = 'scroll'
  })

  document.addEventListener('keydown', e => {
    if ( e.keyCode === 27 ) {
      modal.style.animation = 'modalOut 500ms forwards'
      modal.addEventListener('animationend', modalClose)
      document.body.style.overflowY = 'scroll'
    }
  })

  modalOpen()

})

//Particles JS config
particlesJS("particles", {
  particles: {
    number: { value: 160, density: { enable: true, value_area: 800 } },
    color: { value: "#03afc2" },
    shape: {
      type: "circle",
      stroke: { width: 0, color: "#000000" },
      polygon: { nb_sides: 5 } 
    },
    opacity: {
      value: 1,
      random: true,
      anim: { enable: true, speed: 1, opacity_min: 0, sync: false }
    },
    size: {
      value: 3,
      random: true,
      anim: { enable: false, speed: 4, size_min: 0.3, sync: false }
    },
    line_linked: {
      enable: false,
      distance: 150,
      color: "#ffffff",
      opacity: 0.4,
      width: 1
    },
    move: {
      enable: true,
      speed: 1,
      direction: "none",
      random: true,
      straight: false,
      out_mode: "out",
      bounce: false,
      attract: { enable: false, rotateX: 600, rotateY: 600 }
    }
  },
  interactivity: {
    detect_on: "canvas",
    events: {
      onhover: { enable: true, mode: "bubble" },
      onclick: { enable: true, mode: "repulse" },
      resize: true
    },
    modes: {
      grab: { distance: 400, line_linked: { opacity: 1 } },
      bubble: { distance: 250, size: 0, duration: 2, opacity: 0, speed: 3 },
      repulse: { distance: 400, duration: 0.4 },
      push: { particles_nb: 4 },
      remove: { particles_nb: 2 }
    }
  },
  retina_detect: true
});
var count_particles, stats, update;
stats = new Stats();
stats.setMode(0);
stats.domElement.style.position = "absolute";
stats.domElement.style.left = "0px";
stats.domElement.style.top = "0px";
document.body.appendChild(stats.domElement);
count_particles = document.querySelector(".js-count-particles");
update = function() {
  stats.begin();
  stats.end();
  if (window.pJSDom[0].pJS.particles && window.pJSDom[0].pJS.particles.array) {
    count_particles.innerText = window.pJSDom[0].pJS.particles.array.length;
  }
  requestAnimationFrame(update);
};
requestAnimationFrame(update);
!
999px

Console