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HTML 

              
                .page
  %header
    .swoosh.position-fixed
    .sticky-nav.difference.d-flex.justify-content-between
      .logo
      #nav-btn.menu.box
        <svg id="i1" class="icon" viewBox="20 30 60 40">
        <path id="top-line-1"     d="M30,37 L70,37 Z"></path>
        <path id="middle-line-1" 	d="M30,50 L70,50 Z"></path>
        <path id="bottom-line-1" 	d="M30,63 L70,63 Z"></path>
        </svg>
    #takeover-nav
      .container-fluid
        .row
          .nav-col.nav-contact.col-12.col-md-7.bg-black.d-flex.align-items-center.justify-content-center.position-relative.py-5.px-3.order-1.order-md-0
            .position-absolute.w-100.h-100.bg-topographic
            .content.position-relative
              %h2.nav-title.white.mb-5
                build your digital success with us<span class="d-inline green">&period;</span>
              %ul.contact-items.white.list-unstyled.mb-5
                %li.pb-4
                  %a.text-decoration-none{:href => "#"} +1 386-235-4062
                %li.pb-4
                  %a.text-decoration-none{:href => "#"} morgan@tactusmarketing.com
                %li
                  %a.text-decoration-none{:href => "#"} Aguadilla, PR 00603
              .social
                %a.text-decoration-none.green{:href => "#"} linkedin
                %span.mx-2.white
                  |
                %a.text-decoration-none.green{:href => "#"} facebook
                %span.mx-2.white
                  |
                %a.text-decoration-none.green{:href => "#"} instagram
          .nav-col.nav-menu.col-12.col-md-5.bg-green.d-flex.align-items-center.pt-5.pb-3.pb-md-5.px-3.px-md-5.order-0.order-md-1
            %ul.nav-items.list-unstyled
              %li.pb-3
                %a.text-decoration-none{:href => "#"} services
              %li.pb-3
                %a.text-decoration-none{:href => "#"} portfolio
              %li.pb-3
                %a.text-decoration-none{:href => "#"} contact
              %li
                %a.text-decoration-none{:href => "#"} about
  %section.hero.d-flex.align-items-center.justify-content-center
    .video-wrap
      <video autoplay="" playsinline="" loop="" muted="" id="video-bg">
      <source src="https://tactusmarketing.com/wp-content/uploads/tactus-waves-hero.mp4" type="video/mp4">
      <source src="https://tactusmarketing.com/wp-content/uploads/tactus-waves-hero.mp4" type="video/mp4">
      </video>
    .position-absolute.w-100.gradient-overlay
    .content.position-relative.text-center.mb-5
      %h1.hero-title.blend
        Where Creativity 
        %br
        &amp; Strategy Meet
  %section.two
  %section.three
  %section.four
  %section.five
.custom-cursor
!

CSS 

              
                @import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;700;900&display=swap');

$black: #212121;
$white: #efefef;
$pearl: #fff;
$purple: #e8d1f6;
$blue: #29639c;
$green: #00BCD4;
$pink: #b73b3b;

* {
  box-sizing: border-box;
  cursor: none;
}
html,
body {
  background: $white;
  color: $black;
  font-family: 'Montserrat', sans-serif;
  font-size: 16px;
  height: 100%;
}
::selection {
  background: $white;
  color: $black;
  mix-blend-mode: difference;
}
::-moz-selection {
  background: $white;
  color: $black;
}
h1, h2, h3, h4, h5 {
  font-weight: 900;
}
h1 {
  font-size: 3em;
}
.hero-title {
  font-size: 8vw;
  line-height: 1em;
  font-weight: 900;
}
.nav-title {
  font-size: 4em;
}
a {
  transition: all .25s ease-in-out;
}
.white, a.white {
  color: $white;
}
.black {
  color: $black;
}
.pearl, a.pearl {
  color: $pearl;
}
.green, a.green {
  color: $green;
}
.pink {
  color: $pink;
}
.blend {
  mix-blend-mode: difference !important;
  color: $white;
  position: relative;
  z-index: 2;
}
.bg-black {
  background-color: $black;
}
.bg-green {
  background-color: $green;
}
.bg-topographic {
  background-image: url(https://assets.codepen.io/319606/bg-topographic.svg);
  background-size: 5000px;
  opacity: .1;
  pointer-events: none;
}
.custom-cursor {
  position: fixed;
  opacity: 0;
  pointer-events: none;
  mix-blend-mode: difference;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background-color: $green;
  transition: transform 350ms ease;
  transform: translate(-50%, -50%) scale(.3);
  z-index: 1000;
}
.custom-cursor--link {
  transform: translate(-50%, -50%) scale(1.25);
}
.swoosh {
  background-image: url('https://assets.codepen.io/319606/2023-logo-swoosh.svg');
  background-size: 100%;
  background-repeat: no-repeat;
  top: 20px;
  left: 18px;
  width: 230px;
  height: 45px;
  z-index: 1000;
  background-position: left;
}
.sticky-nav {
  top: 20px;
  left: 20px;
  position: fixed;
  width: calc(100% - 40px);
  z-index: 999;
  
  &.difference {
    background-repeat: no-repeat;
    background-size: contain;
    mix-blend-mode: difference;
    // filter: invert(1);
    
    #nav-btn {
      filter: invert(0);
    }
  }
  
  .logo {
    width: 220px;
    height: 45px;
    background-image: url(https://assets.codepen.io/319606/2023-logo-white.svg);
    background-size: 100%;
    background-repeat: no-repeat;
    background-position: left;
    z-index: 998;
  }
  
  #nav-btn {
    width: 60px;
    z-index: 999;
    filter: invert(1);
    
    .icon {
      position: relative;
      width: 100%; 
      height: 100%;
      fill: none;
      stroke-width: 8;
      stroke-linecap: round;
      stroke-linejoin: round;
      // cursor: pointer;
      stroke: #fff;
    }
  }
  
}


#takeover-nav {
  position: fixed;
  width: 100vw;
  height: 100vh;
  overflow-y: auto;
  left: 0;
  top: -200%;
  transition: all .5s ease-in-out;
  z-index: 996;
  
  &.shown {
    top: 0;
  }
  
  .nav-col {
    min-height: 100vh;
    
    a {
      color: $white;
      
      &:hover {
        color: $black;
      }
    }
  }
  
  .nav-contact {
    
    .content {
      max-width: 700px;
    }
  }
  
  .nav-items {
    font-size: 2.5em;
    font-weight: 700;
  }
  
  .contact-items {
    font-size: 1.25em;
    font-weight: 700;
    
    a:hover {
      color: $green;
    }
  }
  
  .social {
    font-size: .75em;
    
    a {
      color: $green;

      &:hover {
        color: $white;
      }
    }
  }
}

.gradient-overlay {
  bottom: 0;
  height: 50%;
  background: -moz-linear-gradient(top,  rgba(33,33,33,0) 0%, rgba(33,33,33,1) 50%);
  background: -webkit-linear-gradient(top,  rgba(33,33,33,0) 0%,rgba(33,33,33,1) 50%);
  background: linear-gradient(to bottom,  rgba(33,33,33,0) 0%,rgba(33,33,33,1) 50%);
  filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#00212121', endColorstr='#212121',GradientType=0 );
  z-index: 1;
  border-bottom-right-radius: 15vw;
  pointer-events: none;
}
.video-wrap {
  position: absolute;
  width: 100%;
  height: 100%;
  overflow: hidden;
  border-bottom-right-radius: 15vw;
  pointer-events: none;
}
#video-bg {
  position: absolute;
  width: 100%;
  height: 100%;
  min-width: 100%;
  background-position: center center;
  background-size: cover;
  object-fit: cover;
  transform: rotate(180deg);
}

section {
  min-height: 800px;
  height: 800px;
  width: 100%;
  
  &.hero {
    background-color: $black;
    border-bottom-right-radius: 15vw;
    position: relative;
    
    &:before {
      content: "";
      background-color: $black;
      position: absolute;
      top: 100%;
      left: 0;
      width: 15vw;
      height: 15vw;
    }
    
    &:after {
      content: "";
      background-color: $white;
      position: absolute;
      top: 100%;
      left: 0;
      width: 15vw;
      height: 15vw;
      border-top-left-radius: 15vw;
    }
  }
  
  &.two {
    background-color: $white;
  }
  
  &.three {
    background-color: $purple;
  }
  
  &.four {
    background-color: $green;
  }
  &.five {
    background-color: $blue;
  }
}


@media screen and (min-width: 1200px) {
  .hero {
    height: 75vh;
  
    #video-bg {
      object-position: 0 5vw;
    }
  }
}

@media screen and (max-width: 1199px) {
  .hero {
    
    #video-bg {
      object-position: 0 15vw;
    }
  }
}

@media screen and (max-width: 767px) {
  #takeover-nav {
    .nav-menu {
      min-height: 500px;
      
      a {
        color: $black;
        
        &:hover {
          color: $white
        }
      }
    }
    .nav-contact {
      min-height: 600px;
      
      .nav-title {
        font-size: 2.5em;
      }
    }
  }
}

@media screen and (max-width: 575px) {
  header {
    .swoosh {
      width: 165px;
      height: 35px;
      top: 10px;
    }
    .sticky-nav {
      top: 10px;
      
      .logo {
        width: 150px;
        height: 35px;
      }
      
      #nav-btn {
        width: 40px;
      }
    }
    #takeover-nav {
      .contact-items {
        font-size: 1em;
      }
    }
  }
  .hero {
    min-height: 600px;
    height: 600px;
    
    .hero-title {
      font-size: 12vw;
    }
    
    #video-bg {
      object-position: 0 30vw;
    }
  }
}
!

JS 

              
                $( "#nav-btn" ).on( "click", function() {
  $('#takeover-nav').toggleClass("shown");
  $('.sticky-nav').toggleClass("difference");
});



///Initiation Variables
var icon_1 = document.getElementById("nav-btn");
var topLine_1 = document.getElementById("top-line-1");
var middleLine_1 = document.getElementById("middle-line-1");
var bottomLine_1 = document.getElementById("bottom-line-1");
var state_1 = "menu";  // can be "menu" or "arrow"
var topLineY_1;
var middleLineY_1;
var bottomLineY_1;
var topLeftY_1;
var topRightY_1;
var bottomLeftY_1;
var bottomRightY_1;
var topLeftX_1;
var topRightX_1;
var bottomLeftX_1;
var bottomRightX_1;

///Animation Variables
var segmentDuration_1 = 15;
var menuDisappearDurationInFrames_1 = segmentDuration_1;
var arrowAppearDurationInFrames_1 = segmentDuration_1;
var arrowDisappearDurationInFrames_1 = segmentDuration_1;
var menuAppearDurationInFrames_1 = segmentDuration_1;
var menuDisappearComplete_1 = false;
var arrowAppearComplete_1 = false;
var arrowDisappearComplete_1 = false;
var menuAppearComplete_1 = false;
var currentFrame_1 = 1;

///Menu Disappear 
function menuDisappearAnimation_1() {
	currentFrame_1++;
	if ( currentFrame_1 <= menuDisappearDurationInFrames_1 ) {
		window.requestAnimationFrame( ()=> { 
			//top line
			topLineY_1 = AJS.easeInBack( 37, 50, menuDisappearDurationInFrames_1, currentFrame_1 );
			topLine_1.setAttribute( "d", "M30,"+topLineY_1+" L70,"+topLineY_1 );
			//bottom line
			bottomLineY_1 = AJS.easeInBack( 63, 50, menuDisappearDurationInFrames_1, currentFrame_1 );
			bottomLine_1.setAttribute( "d", "M30,"+bottomLineY_1+" L70,"+bottomLineY_1 );
			//recursion
			menuDisappearAnimation_1();
		});
	} else {
		middleLine_1.style.opacity = "0";
		currentFrame_1 = 1;
		menuDisappearComplete_1 = true;
		openMenuAnimation_1();
	}
}

///Cross Appear
function arrowAppearAnimation_1() {
	currentFrame_1++;
	if ( currentFrame_1 <= arrowAppearDurationInFrames_1 ) {
		window.requestAnimationFrame( ()=> { 
			//top line
			topLeftX_1 = AJS.easeOutBack( 30, 35, arrowAppearDurationInFrames_1, currentFrame_1 );
			topLeftY_1 = AJS.easeOutBack( 50, 35, arrowAppearDurationInFrames_1, currentFrame_1 );
			bottomRightX_1 = AJS.easeOutBack( 70, 65, arrowAppearDurationInFrames_1, currentFrame_1 );
			bottomRightY_1 = AJS.easeOutBack( 50, 65, arrowAppearDurationInFrames_1, currentFrame_1 );
			topLine_1.setAttribute( "d", "M" + topLeftX_1 + "," + topLeftY_1 + " L" + bottomRightX_1 + "," + bottomRightY_1 );
			//bottom line
			bottomLeftX_1 = AJS.easeOutBack( 30, 35, arrowAppearDurationInFrames_1, currentFrame_1 );
			bottomLeftY_1 = AJS.easeOutBack( 50, 65, arrowAppearDurationInFrames_1, currentFrame_1 );
			topRightX_1 = AJS.easeOutBack( 70, 65, arrowAppearDurationInFrames_1, currentFrame_1 );
			topRightY_1 = AJS.easeOutBack( 50, 35, arrowAppearDurationInFrames_1, currentFrame_1 );
			bottomLine_1.setAttribute( "d", "M" + bottomLeftX_1 + "," + bottomLeftY_1 + " L" + topRightX_1 + "," + topRightY_1 );
			//recursion
			arrowAppearAnimation_1();
		});
	} else {
		currentFrame_1 = 1;
		arrowAppearComplete_1 = true;
		openMenuAnimation_1();
	}
}

///Combined Open Menu Animation
function openMenuAnimation_1() {
	if ( !menuDisappearComplete_1 ) { 
		menuDisappearAnimation_1();
	} else if ( !arrowAppearComplete_1) {
		arrowAppearAnimation_1();
	}
}

///Cross Disappear
function arrowDisappearAnimation_1() {
	currentFrame_1++;
	if ( currentFrame_1 <= arrowDisappearDurationInFrames_1 ) {
		window.requestAnimationFrame( ()=> {
			//top line
			topLeftX_1 = AJS.easeInBack( 35, 30, arrowDisappearDurationInFrames_1, currentFrame_1 );
			topLeftY_1 = AJS.easeInBack( 35, 50, arrowDisappearDurationInFrames_1, currentFrame_1 );
			bottomRightX_1 = AJS.easeInBack( 65, 70, arrowDisappearDurationInFrames_1, currentFrame_1 );
			bottomRightY_1 = AJS.easeInBack( 65, 50, arrowDisappearDurationInFrames_1, currentFrame_1 );
			topLine_1.setAttribute( "d", "M" + topLeftX_1 + "," + topLeftY_1 + " L" + bottomRightX_1 + "," + bottomRightY_1 );
			//bottom line
			bottomLeftX_1 = AJS.easeInBack( 35, 30, arrowDisappearDurationInFrames_1, currentFrame_1 );
			bottomLeftY_1 = AJS.easeInBack( 65, 50, arrowDisappearDurationInFrames_1, currentFrame_1 );
			topRightX_1 = AJS.easeInBack( 65, 70, arrowDisappearDurationInFrames_1, currentFrame_1 );
			topRightY_1 = AJS.easeInBack( 35, 50, arrowDisappearDurationInFrames_1, currentFrame_1 );
			bottomLine_1.setAttribute( "d", "M" + bottomLeftX_1 + "," + bottomLeftY_1 + " L" + topRightX_1 + "," + topRightY_1 );
			//recursion
			arrowDisappearAnimation_1();
		});
	} else {
		middleLine_1.style.opacity = "1";
		currentFrame_1 = 1;
		arrowDisappearComplete_1 = true;
		closeMenuAnimation_1();
	}
}

///Menu Appear
function menuAppearAnimation_1() {
	currentFrame_1++;
	if ( currentFrame_1 <= menuAppearDurationInFrames_1 ) {
		window.requestAnimationFrame( ()=> {
			//top line
			topLineY_1 = AJS.easeOutBack( 50, 37, menuDisappearDurationInFrames_1, currentFrame_1 );
			topLine_1.setAttribute( "d", "M30,"+topLineY_1+" L70,"+topLineY_1 );
			//bottom line
			bottomLineY_1 = AJS.easeOutBack( 50, 63, menuDisappearDurationInFrames_1, currentFrame_1 );
			bottomLine_1.setAttribute( "d", "M30,"+bottomLineY_1+" L70,"+bottomLineY_1 );
			//recursion
			menuAppearAnimation_1();
		});
	} else {
		currentFrame_1 = 1;
		menuAppearComplete_1 = true;
		closeMenuAnimation_1();
	}
}

///Close Menu Animation
function closeMenuAnimation_1() {
	if ( !arrowDisappearComplete_1 ) {
		arrowDisappearAnimation_1();
	} else if ( !menuAppearComplete_1 ) {
		menuAppearAnimation_1();
	}
}

///Events
icon_1.addEventListener( "click", ()=> { 
  if ( state_1 === "menu" ) {
  	openMenuAnimation_1();
  	state_1 = "arrow";
  	arrowDisappearComplete_1 = false;
		menuAppearComplete_1 = false;
  } else if ( state_1 === "arrow" ) {
  	closeMenuAnimation_1();
  	state_1 = "menu";
  	menuDisappearComplete_1 = false;
		arrowAppearComplete_1 = false;
  }
});


// Cursor
document.addEventListener("DOMContentLoaded", function(event) {
  var cursor = document.querySelector(".custom-cursor");
  var links = document.querySelectorAll("a, button, #nav-btn, input.btn");

  var initCursor = false;

  for (var i = 0; i < links.length; i++) {
    var selfLink = links[i];

    selfLink.addEventListener("mouseover", function() {
      cursor.classList.add("custom-cursor--link");
    });
    selfLink.addEventListener("mouseout", function() {
      cursor.classList.remove("custom-cursor--link");
    });
  }


  window.onmousemove = function(e) {
    var mouseX = e.clientX;
    var mouseY = e.clientY;

    if (!initCursor) {
      // cursor.style.opacity = 1;
      TweenLite.to(cursor, 0.5, {
        opacity: 1
      });
      initCursor = true;
    }

    TweenLite.to(cursor, 0, {
      top: mouseY + "px",
      left: mouseX + "px"
    });
  };
  
  window.ontouchmove = function(e) {
    var mouseX = e.touches[0].clientX;
    var mouseY = e.touches[0].clientY;
    if (!initCursor) {
      // cursor.style.opacity = 1;
      TweenLite.to(cursor, 0.3, {
        opacity: 1
      });
      initCursor = true;
    }

    TweenLite.to(cursor, 0, {
      top: mouseY + "px",
      left: mouseX + "px"
    });
  };

  window.onmouseout = function(e) {
    TweenLite.to(cursor, 0.3, {
      opacity: 0
    });
    initCursor = false;
  };

  window.ontouchstart = function(e) {
    TweenLite.to(cursor, 0.3, {
      opacity: 1
    });
  };
  
  window.ontouchend = function(e) {
    setTimeout( function() {
      TweenLite.to(cursor, 0.3, {
        opacity: 0
      });
    }, 200);   
  };
  
});
!
999px

Console