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HTML 

              
                <div class="container"></div>

<script type="x-shader/x-fragment" id="gooey-fragmentShader">
    precision highp float;

    const int col_number = 20;

    uniform float u_ratio;
    uniform float u_time;
    uniform float u_hover_times_fst[col_number];
    uniform float u_hover_times_scd[col_number];
    uniform float u_hover_times_trd[col_number];
    varying vec2 vUv;

    #define TWO_PI 6.28318530718
    #define PI 3.141592653589

    float random(in vec2 st) {
        return fract(sin(dot(st.xy, vec2(12.9898, 78.233)))*43758.5453123);
    }

    float circle(vec2 pos, vec2 uv, float radius) {
        return smoothstep(0., length(uv - pos), radius);
    }

    float calc_column_shape(vec2 pos, vec2 uv, float width) {
        float bt = 1. - smoothstep(0., width, abs(uv.x - pos.x));
        bt *= smoothstep(pos.y - width * 1.5, pos.y, uv.y);

        return max(bt, 0.);
    }

    float calc_bottom(vec2 uv) {
        uv.y *= 5.;
        uv.y = smoothstep(0., 1., uv.y);
        return 1. - uv.y;
    }

    void main() {

        vec2 uv = vUv;
        uv.x *= u_ratio;
		 
        float col_w = u_ratio / float(col_number);
        float radius = col_w * .12;

        float sum = calc_bottom(uv);

        for (int i = 0; i <= col_number; i++) {
            float randomiser = random(vec2(float(i), float(i) * .2));
            float x = col_w * (.5 + float(i));

            float col_time = u_time + TWO_PI * randomiser;
            float y_col = .7 + .3 * sin(col_time);
            float col_shape = calc_column_shape(vec2(x, y_col), uv, col_w);
            sum += col_shape;

            float is_way_down = step(sin(col_time + .5 * PI), 0.);
            vec2 drop_center;
            float y_drop_falling = .8 - y_col;
            y_drop_falling *= step(0., sin(u_time + TWO_PI * randomiser + .25 * TWO_PI));
            y_drop_falling = is_way_down * y_col + (1. - is_way_down) * y_drop_falling;
            drop_center = vec2(x, y_drop_falling);
            float drop_falling_shape = circle(drop_center, uv, radius * 1.8 * (1. - uv.y));
            sum += drop_falling_shape;

            drop_center = vec2(x, y_col);
            float drop_staying_shape = circle(drop_center, uv, radius * 1.3 * (1. - y_col));
            sum += drop_staying_shape;

            float drop_interactive_shape;

            drop_center = vec2(x, y_col - u_hover_times_fst[i]);
            drop_interactive_shape = circle(drop_center, uv, radius);
            sum += drop_interactive_shape;
            drop_center = vec2(x, y_col - u_hover_times_scd[i]);
            drop_interactive_shape = circle(drop_center, uv, radius);
            sum += drop_interactive_shape;
            drop_center = vec2(x, y_col - u_hover_times_trd[i]);
            drop_interactive_shape = circle(drop_center, uv, radius);
            sum += drop_interactive_shape;
        }

        vec3 color = mix(vec3(.92), mix(vec3(.91, .39, .26), vec3(.56, .31, .58), uv.y), smoothstep(.7, .72, sum));

        gl_FragColor = vec4(color, 1.);
    }
</script>
<script type="x-shader/x-vertex" id="gooey-vertexShader">
    attribute vec3 position;
    attribute vec2 uv;

    varying vec2 vUv;

    void main() {
        vUv = uv;
        gl_Position = vec4(position, 1.0);
    }
</script>
!

CSS 

              
                html, body {
    overflow: hidden;
    padding: 0;
    margin: 0;
}
.container {
    width: 100%;
	 max-width: 200vh;
    height: 100vh;
	 margin: 0 auto;
}
canvas {
    display: block;
}
!

JS 

              
                import * as THREE from 'https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.module.min.js';

const container = document.querySelector('.container');
const numOfColumns = 20; // should be same in GLSL, prob passed as #define?
const magicValue = -1; // I know, I know

let size = {
    w: container.offsetWidth,
    h: container.offsetHeight
};
document.addEventListener('DOMContentLoaded', () => {
    let surface = new Surface(size.w, size.h);
    surface.updateSize(size.w, size.h);
    window.addEventListener('resize', () => {
        size = {
            w: container.offsetWidth,
            h: container.offsetHeight
        };
        surface.updateSize(size.w, size.h);
    });

    container.addEventListener('mousemove', (e) => {
        updateMousePosition(e.clientX, e.clientY);
    });
    container.addEventListener('touchmove', (e) => {
        updateMousePosition(e.targetTouches[0].pageX, e.targetTouches[0].pageY);
    });
    function updateMousePosition(eX) {
        const x = (eX - container.offsetLeft) / container.offsetWidth;
        for (let i = 0; i < numOfColumns; i++) {
            if (x > (i / numOfColumns) && x < (i + 1) / numOfColumns) {
                if (surface.fstHoverTimes[i] === magicValue) {
                    surface.fstHoverTimes[i] = 0;
                } else if (surface.fstHoverTimes[i] > .5 && surface.scdHoverTimes[i] === magicValue) {
                    surface.scdHoverTimes[i] = 0;
                } else if (surface.scdHoverTimes[i] > .5 && surface.trdHoverTimes[i] === magicValue) {
                    surface.trdHoverTimes[i] = 0;
                }
            }
        }
    }

    surface.loop();
});

class Surface {

    constructor(w, h) {
        this.renderer = new THREE.WebGLRenderer({ antialias: true });
        this.renderer.setPixelRatio(window.devicePixelRatio);
        container.appendChild(this.renderer.domElement);
        this.scene = new THREE.Scene();
        this.camera = new THREE.Camera();
        this.fstHoverTimes = new Array(numOfColumns).fill(magicValue);
        this.scdHoverTimes = new Array(numOfColumns).fill(magicValue);
        this.trdHoverTimes = new Array(numOfColumns).fill(magicValue);
        this.createPlane(w, h);
        this.render();
    }

    createPlane() {
        this.material = new THREE.RawShaderMaterial({
            vertexShader: document.getElementById('gooey-vertexShader').textContent,
            fragmentShader: document.getElementById('gooey-fragmentShader').textContent,
            uniforms: {
                u_time: { type: 'f', value: 0 },
                u_ratio: { type: 'f', value: 1 },
                u_hover_times_fst: { type: 'f', value: this.fstHoverTimes },
                u_hover_times_scd: { type: 'f', value: this.scdHoverTimes },
                u_hover_times_trd: { type: 'f', value: this.trdHoverTimes }
            }
        });

        this.planeGeometry = new THREE.PlaneBufferGeometry(2, 2);
        this.plane = new THREE.Mesh(this.planeGeometry, this.material);
        this.scene.add(this.plane);
    }

    render() {
        this.plane.material.uniforms.u_time.value += .007;
        this.plane.material.uniforms.u_ratio.value = size.w / size.h;
        for (let i = 0; i < numOfColumns; i++) {
            this.fstHoverTimes[i] = updateHoverTime(this.fstHoverTimes[i]);
            this.scdHoverTimes[i] = updateHoverTime(this.scdHoverTimes[i]);
            this.trdHoverTimes[i] = updateHoverTime(this.trdHoverTimes[i]);
        }
        this.plane.material.uniforms.u_hover_times_fst.value = this.fstHoverTimes;
        this.plane.material.uniforms.u_hover_times_scd.value = this.scdHoverTimes;
        this.plane.material.uniforms.u_hover_times_trd.value = this.trdHoverTimes;
        this.renderer.render(this.scene, this.camera);
        function updateHoverTime(v) {
            if (v !== magicValue) {
                v += .008;
                if (v > 1) {
                    v = magicValue;
                }
            }
            return v;
        }
    }

    loop() {
        this.render();
        requestAnimationFrame(this.loop.bind(this));
    }

    updateSize() {
        this.camera.aspect = size.w / size.h;
        this.renderer.setSize(size.w, size.h);
    }
}
!
999px

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