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HTML 

              
                h1 Magnetic Button
main
  .divisor
    a.magnetic-wrap.size1(href="#")
      .js-magnetic-area.magnetic-size
      .js-magnetic-content
        .my-burger
    p Perfect example.
  .divisor
    a.magnetic-wrap.size2(href="#")
      .js-magnetic-area.magnetic-area.magnetic-size.wrong
      .js-magnetic-content
        .my-burger
    p Uneven and square areas don't work.
footer
!

CSS 

              
                $magnetic-size: 3rem;
$magnetic-size2: 5rem;

.magnetic-wrap {
  display: inline-block;
  position: relative;
}

.my-burger {
  width: 4rem;
  height: 4rem;
  border-radius: 2rem;
  background: #ffb31a;
}

.magnetic-size {
  position: absolute;
  bottom: -$magnetic-size;
  top: -$magnetic-size;
  left: -$magnetic-size;
  right: -$magnetic-size;
  z-index: 1; // The area has to be on top
  border-radius: 50%;
  border: 2px dashed #333; // Guideline to visualize the area
}

.size1 {
  margin: $magnetic-size;
}
.size2 {
  margin: $magnetic-size2;
}

.wrong {
  background: rgba(red, 0.2);
  bottom: -$magnetic-size2;
  top: -$magnetic-size2;
  left: -$magnetic-size2;
  right: 0;
  border-radius: 0;
}

///////////////////////////
// Made for this example //
///////////////////////////

body {
  font-family: Roboto;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  background: rgb(15, 20, 30);
  color: white;
  min-height: 100vh;
  margin: 0;
}
main {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
}
p {
  text-align: center;
  color: rgba(white, 0.8);
}
.divisor {
  margin: $magnetic-size;
}
!

JS 

              
                var mWrap = document.querySelectorAll(".magnetic-wrap");

function parallaxIt(e, wrap, movement = 1) {
  var scrollTop = window.pageYOffset || document.documentElement.scrollTop;
  var boundingRect = wrap.mArea.getBoundingClientRect();
  var relX = e.pageX - boundingRect.left;
  var relY = e.pageY - boundingRect.top;

  gsap.to(wrap.mContent, {
    x: (relX - boundingRect.width / 2) * movement,
    y: (relY - boundingRect.height / 2 - scrollTop) * movement,
    ease: "power1",
    duration: 0.6
  });
}

mWrap.forEach(function (wrap) {
  wrap.mContent = wrap.querySelector(".js-magnetic-content");
  wrap.mArea = wrap.querySelector(".js-magnetic-area");
  
  wrap.mArea.addEventListener("mousemove", function(e) {
    parallaxIt(e, wrap);
  });
  
  wrap.mArea.addEventListener("mouseleave", function (e) {
    gsap.to(wrap.mContent, {
      scale: 1,
      x: 0,
      y: 0,
      ease: "power3",
      duration: 0.6
    });
  });
});
!
999px

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