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HTML 

              
                <!-- about -->
<div class="about">
   <a class="bg_links social portfolio" href="https://www.rafaelalucas.com" target="_blank">
      <span class="icon"></span>
   </a>
   <a class="bg_links social dribbble" href="https://dribbble.com/rafaelalucas" target="_blank">
      <span class="icon"></span>
   </a>
   <a class="bg_links social linkedin" href="https://www.linkedin.com/in/rafaelalucas/" target="_blank">
      <span class="icon"></span>
   </a>
   <a class="bg_links logo"></a>
</div>
<!-- end about -->

<nav class="mainNav">
   <div class="mainNav__logo">Logo</div>
   <div class="mainNav__links">
      <a href="" class="mainNav__link">About</a>
      <a href="" class="mainNav__link">Projects</a>
      <a href="" class="mainNav__link">Team</a>
      <a href="" class="mainNav__link">Contacts</a>
   </div>
   <div class="mainNav__icon">
      <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24">
         <g data-name="Layer 2" fill="#9197AE">
            <g data-name="menu-2">
               <rect
                  width="24"
                  height="24"
                  transform="rotate(180 12 12)"
                  opacity="0"
               />
               <circle cx="4" cy="12" r="1" />
               <rect x="7" y="11" width="14" height="2" rx=".94" ry=".94" />
               <rect x="3" y="16" width="18" height="2" rx=".94" ry=".94" />
               <rect x="3" y="6" width="18" height="2" rx=".94" ry=".94" />
            </g>
         </g>
      </svg>
   </div>
</nav>
<header class="mainHeading">
   <div class="mainHeading__content">
      <article class="mainHeading__text">
         <p class="mainHeading__preTitle">nature</p>
         <h2 class="mainHeading__title">behind the mountains</h2>
         <p class="mainHeading__description">
            Far far away, behind the word mountains, far from the countries
            Vokalia and Consonantia, there live the blind texts.
         </p>
         <button class="cta">know more</button>
      </article>

      <figure class="mainHeading__image">
         <img
            src="https://images.unsplash.com/photo-1520856707909-75c4048cc858?ixlib=rb-1.2.1&auto=format&fit=crop&w=1534&q=80"
            alt=""
         />
      </figure>
   </div>
</header>
!

CSS 

              
                .about {
   $cubic: cubic-bezier(0.64, 0.01, 0.07, 1.65);
   $transition: 0.6s $cubic;
   $size: 40px;
   position: fixed;
   z-index: 10;
   bottom: 10px;
   right: 10px;
   width: $size;
   height: $size;
   display: flex;
   justify-content: flex-end;
   align-items: flex-end;
   transition: all 0.2s ease;

   .bg_links {
      width: $size;
      height: $size;
      border-radius: 100%;
      display: flex;
      justify-content: center;
      align-items: center;
      background-color: rgba(#000000, 0.2);
      border-radius: 100%;
      backdrop-filter: blur(5px);
      position: absolute;
   }

   .logo {
      width: $size;
      height: $size;
      z-index: 9;
      background-image: url(https://rafaelavlucas.github.io/assets/codepen/logo_white.svg);
      background-size: 50%;
      background-repeat: no-repeat;
      background-position: 10px 7px;
      opacity: 0.9;
      transition: all 1s 0.2s ease;
      bottom: 0;
      right: 0;
   }

   .social {
      opacity: 0;
      right: 0;
      bottom: 0;

      .icon {
         width: 100%;
         height: 100%;
         background-size: 20px;
         background-repeat: no-repeat;
         background-position: center;
         background-color: transparent;
         display: flex;
         transition: all 0.2s ease, background-color 0.4s ease;
         opacity: 0;
         border-radius: 100%;
      }

      &.portfolio {
         transition: all 0.8s ease;

         .icon {
            background-image: url(https://rafaelavlucas.github.io/assets/codepen/link.svg);
         }
      }

      &.dribbble {
         transition: all 0.3s ease;
         .icon {
            background-image: url(https://rafaelavlucas.github.io/assets/codepen/dribbble.svg);
         }
      }

      &.linkedin {
         transition: all 0.8s ease;
         .icon {
            background-image: url(https://rafaelavlucas.github.io/assets/codepen/linkedin.svg);
         }
      }
   }

   &:hover {
      width: 105px;
      height: 105px;
      transition: all $transition;

      .logo {
         opacity: 1;
         transition: all 0.6s ease;
      }

      .social {
         opacity: 1;

         .icon {
            opacity: 0.9;
         }

         &:hover {
            background-size: 28px;
            .icon {
               background-size: 65%;
               opacity: 1;
            }
         }

         &.portfolio {
            right: 0;
            bottom: calc(100% - 40px);
            transition: all 0.3s 0s $cubic;
            .icon {
               &:hover {
                  background-color: #698fb7;
               }
            }
         }

         &.dribbble {
            bottom: 45%;
            right: 45%;
            transition: all 0.3s 0.15s $cubic;
            .icon {
               &:hover {
                  background-color: #ea4c89;
               }
            }
         }

         &.linkedin {
            bottom: 0;
            right: calc(100% - 40px);
            transition: all 0.3s 0.25s $cubic;
            .icon {
               &:hover {
                  background-color: #0077b5;
               }
            }
         }
      }
   }
}


@import url("https://fonts.googleapis.com/css?family=Raleway:100,200,300,400,500,600,700,800,900&display=swap");

$font-01: "Raleway", sans-serif;

$gradient-02: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
$gradient-01: linear-gradient(to top, #accbee 0%, #e7f0fd 100%);

$m-01: #9197ae;
$m-02: #637498;

@mixin sm {
   @media screen and (max-width: 799px) {
      @content;
   }
}

* {
   margin: 0;
   padding: 0;
   list-style: none;
   border: 0;
   outline: 0;
   -webkit-tap-highlight-color: transparent;
   text-decoration: none;
   color: inherit;
   box-sizing: border-box;

   &:focus {
      outline: 0;
   }
}

body {
   font-family: $font-01;
}

.mainNav {
   width: 100%;
   height: 80px;
   position: absolute;
   z-index: 1;
   display: flex;
   justify-content: space-between;
   align-items: center;
   color: $m-01;
   text-transform: uppercase;
   padding: 0 40px;
   @include sm {
      padding: 0 20px;
   }

   &__logo {
      font-weight: 800;
      letter-spacing: 1px;
      font-size: 18px;
   }

   &__links {
      display: flex;
      @include sm {
         display: none;
      }
   }

   &__link {
      letter-spacing: 1px;
      font-size: 14px;
      margin-left: 20px;
      font-weight: 600;
      box-shadow: inset 0px -10px 0px rgba(white, 0.5);
      transition: all 0.4s ease, transform 0.2s ease;
      padding: 2px 4px;
      transform: translateY(0px); 
      
      &:hover {
        transform: translateY(-5px);
        box-shadow: inset 0px -20px 0px white; 
      }
   }

   &__icon {
      background-image: url(https://rafaelalucas91.github.io/assets/icons/black/icon-141.svg);
      width: 32px;
      height: 32px;
      background-size: contain;
      background-repeat: no-repeat;
      background-position: center;
      display: none;

      @include sm {
         display: block;
      }
   }
}

.mainHeading {
   width: 100%;
   height: 100%;
   position: relative;
   padding: 0 40px;
   background-image: $gradient-01;
   

   @include sm {
      padding: 0 20px;
   }

   &__content {
      max-width: 1110px;
      min-height: 600px;
      left: 50%;
      transform: translateX(-50%);
      display: flex;
      justify-content: space-between;
      align-items: center;
      position: relative;

      @include sm {
         min-height: 500px;
      }
   }

   &__text {
      z-index: 1;
      color: $m-02;
      background-color: rgba(white, 0.2);
      padding: 40px;
      max-width: 620px;
      margin-top: 100px;
      width: 70%;
      backdrop-filter: blur(8px);
      animation: text 0.8s 0.6s ease backwards;
      position: relative;
      
      &:before {
         content: "";
         position: absolute;
         width: 5px;
         height: 100%;
         background-color: rgba(white, 0.5);
         top:0;
         left:0;
         animation: line 0.8s 0.6s ease backwards;
         @keyframes line {
         0% {
            right:0;
            width:100%;
            opacity:0;
         }
      }
      }

      @include sm {
         padding: 20px;
         margin: 90px 0 40px 0;
      }

      @keyframes text {
         0% {
            opacity: 0;
            transform: translateX(200px);
         }
      }
   }

   &__preTitle {
      text-transform: uppercase;
      font-weight: 600;
      letter-spacing: 2px;
      margin-bottom: 16px;
      color: $m-02;
   }

   &__title {
      text-transform: uppercase;
      font-weight: 200;
      letter-spacing: 2px;
      margin-bottom: 24px;
      font-size: 40px;
      color: $m-02;

      @include sm {
         margin-bottom: 16px;
         font-size: 28px;
      }
   }

   &__description {
      letter-spacing: 0.5px;
      font-size: 16px;
      line-height: 26px;
      @include sm {
         font-size: 14px;
      }
   }

   &__image {
      right: 0;
      max-width: 600px;
      width: 60%;
      height: 600px;
      transform: translatey(100px);
      position: absolute;
      overflow: hidden;
      animation: image 0.6s 0.2s ease backwards;

      @include sm {
         height: 480px;
         width: 70%;
         transform: translatey(80px);
         right: -6%;
      }

      @keyframes image {
         0% {
            opacity: 0;
            transform: translatey(200px);
         }
      }

      &:before,
      &:after {
         content: "";
         position: absolute;
         width: 100%;
         height: 0%;
         top: 100%;
         background-image: $gradient-01;
         opacity: 1;
         left: 0;
      }

      &:before {
         animation: imageBefore 1s 0.2s ease backwards;

         @keyframes imageBefore {
            0% {
               height: 100%;
               top: 0;
            }
         }
      }

      &:after {
         background-image: $gradient-01;
         height: 100%;
         top: 0;
         opacity: 0.2;
      }
      img {
         width: 100%;
         height: 100%;
      }
   }
}

.cta {
   padding: 16px 32px;
   color: $m-02;
   background-color: transparent;
   border: 1px solid rgba($m-02, 0.4);
   font-family: $font-01;
   text-transform: uppercase;
   letter-spacing: 2px;
   font-weight: 600;
   margin-top: 32px;
   cursor: pointer;
   box-shadow: inset 0px 0px 0px rgba($m-02, 0.2);
   transition: all 0.4s ease;

   &:hover {
      border: 1px solid rgba($m-02, 0.1);
      box-shadow: inset 0px -80px 0px rgba($m-02, 0.1);
      transform: translateY(-5px);
   }
   @include sm {
      margin-top: 16px;
   }
}
!

JS 

              
                var scene = document.getElementById('scene');
var parallaxInstance = new Parallax(scene);
!
999px

Console