Pure CSS Parallax

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                <div class="parallax">
                    <div class="parallax-content">
                        <h1>Pure CSS Parallax</h1>
                    </div>
                </div>


                html{
                    height: 100%;
                    overflow: hidden;
                }
                  
                body{ 
                    margin:0;
                    padding:0;
                    perspective: 1px;
                    height: 100%;
                    overflow-y: scroll;
                    overflow-x: hidden;
                }
                
                 .parallax {
                    display: flex;
                    justify-content: center;
                    align-items: center;
                    height: 100%;
                    width: 100%;
                    transform-style: preserve-3d;
                    background-image: url("dream-dog.jpg");
                    background-position: center;
                    background-size: cover;
                    z-index:2;
                  }
                
                  .parallax-content {
                      transform: translateZ(.25px) scale(.75);
                     }