<div class="wrap-2"><canvas id="liquid"></canvas></div>

.wrap-2{
    position:fixed;
    z-index:-30;
    top:0;
    left:0;
    overflow:hidden;
    height:100vh;
    width:100vw;
    margin:auto;
        background: -webkit-gradient(linear, left top, right bottom, from(#438ee1), to(#973999));
    background: linear-gradient(to bottom right, #FF512F, #DD2476);
}
canvas{
    width:100%;
    height:100%;
}

! function() {
    "use strict";
    var t, i = {
            screen: {
                elem: null,
                callback: null,
                ctx: null,
                width: 0,
                height: 0,
                left: 0,
                top: 0,
                init: function(t, i, s) {
                    return this.elem = document.getElementById(t), this.callback = i || null, "CANVAS" == this.elem.tagName && (this.ctx = this.elem.getContext("2d")), window.addEventListener("resize", function() {
                        this.resize()
                    }.bind(this), !1), this.elem.onselectstart = function() {
                        return !1
                    }, this.elem.ondrag = function() {
                        return !1
                    }, s && this.resize(), this
                },
                resize: function() {
                    var t = this.elem;
                    for (this.width = t.offsetWidth, this.height = t.offsetHeight, this.left = 0, this.top = 0; null != t; t = t.offsetParent) this.left += t.offsetLeft, this.top += t.offsetTop;
                    this.ctx && (this.elem.width = this.width, this.elem.height = this.height), this.callback && this.callback()
                }
            }
        },
        s = function(t, i) {
            this.x = t, this.y = i, this.magnitude = t * t + i * i, this.computed = 0, this.force = 0
        };
    s.prototype.add = function(t) {
        return new s(this.x + t.x, this.y + t.y)
    };
    var h = function(t) {
        var i = .1,
            h = 1.5;
        this.vel = new s((Math.random() > .5 ? 1 : -1) * (.2 + .25 * Math.random()), (Math.random() > .5 ? 1 : -1) * (.2 + Math.random())), this.pos = new s(.2 * t.width + Math.random() * t.width * .6, .2 * t.height + Math.random() * t.height * .6), this.size = t.wh / 15 + (1.4 * Math.random() + .1) * (t.wh / 15), this.width = t.width, this.height = t.height
    };
    h.prototype.move = function() {
        this.pos.x >= this.width - this.size ? (this.vel.x > 0 && (this.vel.x = -this.vel.x), this.pos.x = this.width - this.size) : this.pos.x <= this.size && (this.vel.x < 0 && (this.vel.x = -this.vel.x), this.pos.x = this.size), this.pos.y >= this.height - this.size ? (this.vel.y > 0 && (this.vel.y = -this.vel.y), this.pos.y = this.height - this.size) : this.pos.y <= this.size && (this.vel.y < 0 && (this.vel.y = -this.vel.y), this.pos.y = this.size), this.pos = this.pos.add(this.vel)
    };
    var e = function(t, i, e, o, n) {
        this.step = 5, this.width = t, this.height = i, this.wh = Math.min(t, i), this.sx = Math.floor(this.width / this.step), this.sy = Math.floor(this.height / this.step), this.paint = !1, this.metaFill = r(t, i, t, o, n), this.plx = [0, 0, 1, 0, 1, 1, 1, 1, 1, 1, 0, 1, 0, 0, 0, 0], this.ply = [0, 0, 0, 0, 0, 0, 1, 0, 0, 1, 1, 1, 0, 1, 0, 1], this.mscases = [0, 3, 0, 3, 1, 3, 0, 3, 2, 2, 0, 2, 1, 1, 0], this.ix = [1, 0, -1, 0, 0, 1, 0, -1, -1, 0, 1, 0, 0, 1, 1, 0, 0, 0, 1, 1], this.grid = [], this.balls = [], this.iter = 0, this.sign = 1;
        for (var a = 0; a < (this.sx + 2) * (this.sy + 2); a++) this.grid[a] = new s(a % (this.sx + 2) * this.step, Math.floor(a / (this.sx + 2)) * this.step);
        for (var l = 0; l < e; l++) this.balls[l] = new h(this)
    };
    e.prototype.computeForce = function(t, i, s) {
        var h, e = s || t + i * (this.sx + 2);
        if (0 === t || 0 === i || t === this.sx || i === this.sy) h = .6 * this.sign;
        else {
            h = 0;
            for (var r = this.grid[e], o = 0, n; n = this.balls[o++];) h += n.size * n.size / (-2 * r.x * n.pos.x - 2 * r.y * n.pos.y + n.pos.magnitude + r.magnitude);
            h *= this.sign
        }
        return this.grid[e].force = h, h
    }, e.prototype.marchingSquares = function(t) {
        var i = t[0],
            s = t[1],
            h = t[2],
            e = i + s * (this.sx + 2);
        if (this.grid[e].computed === this.iter) return !1;
        for (var r, o = 0, n = 0; n < 4; n++) {
            var l = i + this.ix[n + 12] + (s + this.ix[n + 16]) * (this.sx + 2),
                d = this.grid[l].force;
            (d > 0 && this.sign < 0 || d < 0 && this.sign > 0 || !d) && (d = this.computeForce(i + this.ix[n + 12], s + this.ix[n + 16], l)), Math.abs(d) > 1 && (o += Math.pow(2, n))
        }
        if (15 === o) return [i, s - 1, !1];
        5 === o ? r = 2 === h ? 3 : 1 : 10 === o ? r = 3 === h ? 0 : 2 : (r = this.mscases[o], this.grid[e].computed = this.iter);
        var p = this.step / (Math.abs(Math.abs(this.grid[i + this.plx[4 * r + 2] + (s + this.ply[4 * r + 2]) * (this.sx + 2)].force) - 1) / Math.abs(Math.abs(this.grid[i + this.plx[4 * r + 3] + (s + this.ply[4 * r + 3]) * (this.sx + 2)].force) - 1) + 1);
        return a.lineTo(this.grid[i + this.plx[4 * r] + (s + this.ply[4 * r]) * (this.sx + 2)].x + this.ix[r] * p, this.grid[i + this.plx[4 * r + 1] + (s + this.ply[4 * r + 1]) * (this.sx + 2)].y + this.ix[r + 4] * p), this.paint = !0, [i + this.ix[r + 4], s + this.ix[r + 8], r]
    }, e.prototype.renderMetaballs = function() {
        for (var t = 0, i; i = this.balls[t++];) i.move();
        for (this.iter++, this.sign = -this.sign, this.paint = !1, a.fillStyle = this.metaFill, a.beginPath(), t = 0; i = this.balls[t++];) {
            var s = [Math.round(i.pos.x / this.step), Math.round(i.pos.y / this.step), !1];
            do {
                s = this.marchingSquares(s)
            } while (s);
            this.paint && (a.fill(), a.closePath(), a.beginPath(), this.paint = !1)
        }
    };
    var r = function(t, i, s, h, e) {
            var r = a.createRadialGradient(t / 1, i / 1, 0, t / 1, i / 1, s);
            return r.addColorStop(0, h), r.addColorStop(1, e), r
        },
        o = function() {
            requestAnimationFrame(o), a.clearRect(0, 0, n.width, n.height), t.renderMetaballs()
        },
        n = i.screen.init("liquid", null, !0),
        a = n.ctx;
    n.resize(), t = new e(n.width, n.height, 6, "#438ee1", "#5BC1F6"), o()
}();