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Dynamic Liquid Bubble Cursor JS

Add a modern liquid bubble cursor to your site. We combined CSS SVG filters and JavaScript to make trailing blobs that merge together beautifully.

103

#javascript

#css

#gooey effect

#liquid cursor

#svg filter

#blob

#interaction

#mouse

/HTML *CSS ()JS Output Live Updates

*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
  margin: 0;
  background: #fafafa;
  min-height: 100vh;
  overflow: hidden;
  cursor: none;
}

.gooey-wrapper {
  width: 100%;
  height: 100vh;
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.content-text {
  text-align: center;
  color: #111827;
  z-index: 10;
  pointer-events: none;
}

.content-text h1 {
  font-size: clamp(3rem, 8vw, 5rem);
  margin: 0 0 10px 0;
  letter-spacing: -1px;
}

.content-text p {
  font-size: 1.25rem;
  color: #4b5563;
  margin: 0;
}

.cursor-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 100;
  filter: url("#goo");
}

.blob {
  position: absolute;
  border-radius: 50%;
  background: #3b82f6;
  transform: translate(-50%, -50%);
  will-change: left, top, width, height;
}

const container = document.getElementById("cursor-container");

const blobs = new Array();
const numBlobs = 6;

let mouseX = window.innerWidth / 2;
let mouseY = window.innerHeight / 2;

window.addEventListener("mousemove", function(e) {
  mouseX = e.clientX;
  mouseY = e.clientY;
});

// Setup the trailing blobs
for (let i = 0; i < numBlobs; i++) {
  const el = document.createElement("div");
  el.className = "blob";
  container.appendChild(el);
  
  const blobObj = new Object();
  blobObj.el = el;
  blobObj.x = mouseX;
  blobObj.y = mouseY;
  
  const size = 60 - (i * 8);
  el.style.width = size + "px";
  el.style.height = size + "px";
  
  blobs.push(blobObj);
}

function animateGoo() {
  let targetX = mouseX;
  let targetY = mouseY;
  
  blobs.forEach(function(blobObj) {
    // Interpolation makes the followers lag gently behind
    blobObj.x += (targetX - blobObj.x) * 0.3;
    blobObj.y += (targetY - blobObj.y) * 0.3;
    
    blobObj.el.style.left = blobObj.x + "px";
    blobObj.el.style.top = blobObj.y + "px";
    
    targetX = blobObj.x;
    targetY = blobObj.y;
  });
  
  window.requestAnimationFrame(animateGoo);
}

animateGoo();

Dynamic Liquid Bubble Cursor JS

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