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CSS

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HTML 

              
                <svg class="bg" width="100vw" height="100vh" preserveAspectRatio="none">
<path d="M -84.52,-81.13 C -94.62,-73.4 -88.88,-59.55 -90.33,-48.91 -89.29,27.31 -89.61,103.5 -88.33,179.8 -85.99,416.1 -81.32,888.9 -81.32,888.9 -81.32,888.9 974.5,888.7 1587,891.9 1518,719.9 1487,644 1429,533 1388,437.7 1447,259.7 1400,187 1362,132 1270,90.53 1207,39.93 1161,2.932 1071,-74.45 1071,-74.45 1071,-74.45 914.5,-77.77 848.2,-80.17 537.6,-80.84 227,-81.38 -83.6,-81.6 -83.91,-81.44 -84.21,-81.29 -84.52,-81.13 Z" pathdata:id="M -84.52,-81.13 C -94.62,-73.4 -88.88,-59.55 -90.33,-48.91 -89.29,27.31 -89.61,103.5 -88.33,179.8 -85.99,416.1 -81.32,888.9 -81.32,888.9 -81.32,888.9 974.5,888.7 1587,891.9 1576,704.7 1517,625.7 1459,514.7 1418,419.4 1430,288.5 1382,187 1349,116.3 1296,54.47 1240,0.3429 1205,-33.51 1120,-83.59 1120,-83.59 1120,-83.59 914.5,-77.77 848.2,-80.17 537.6,-80.84 227,-81.38 -83.6,-81.6 -83.91,-81.44 -84.21,-81.29 -84.52,-81.13 Z"></path>
<path d="M 665.2,-83.08 C 413.7,-81.89 162.2,-82.43 -89.29,-81.61 -90.35,164.3 -85.06,410.2 -84.09,656.1 -83.37,733.7 -82.64,811.3 -81.92,888.9 442.4,889.8 966.7,890.7 1491,891.6 1253,747.5 1417,429.4 1286,245.4 1227,163.2 1107,142.1 1043,64.54 1009,24.41 973,-76.01 973,-76.01 973,-76.01 706.6,-83.67 665.2,-83.08 Z" pathdata:id="M 665.2,-83.08 C 413.7,-81.89 162.2,-82.43 -89.29,-81.61 -90.35,164.3 -85.06,410.2 -84.09,656.1 -83.37,733.7 -82.64,811.3 -81.92,888.9 442.4,889.8 966.7,890.7 1491,891.6 1253,747.5 1349,460.4 1243,260.6 1199,176.6 1145,96.92 1083,24.95 1050,-12.63 973,-76.01 973,-76.01 973,-76.01 706.6,-83.67 665.2,-83.08 Z"></path>
<path d="M -85.01,-74.02 C -92.39,-66.64 -85.37,-55.79 -87.81,-46.91 -86.65,265.1 -84.66,577.2 -83.18,889.2 317.2,888.3 717.5,885.8 1118,890.4 1152,890.6 1187,890.9 1221,890 1219,768.3 1224,643.6 1187,526 1153,417 1091,319.3 1029,224.1 998.8,178.5 968.8,132.6 936.6,88.23 891.7,27.39 772.2,-78.96 772.2,-78.96 772.2,-78.96 222.1,-81.07 -85.01,-74.02 Z" pathdata:id="M -85.01,-74.02 C -92.39,-66.64 -85.37,-55.79 -87.81,-46.91 -86.65,265.1 -84.66,577.2 -83.18,889.2 317.2,888.3 717.5,885.8 1118,890.4 1152,890.6 1187,890.9 1221,890 1219,768.3 1175,659.3 1150,544.3 1128,438.4 1143,312.6 1081,227.1 1004,121.1 925.8,114.8 851.3,54.73 762,-17.34 772.2,-78.96 772.2,-78.96 772.2,-78.96 222.1,-81.07 -85.01,-74.02 Z"></path>
					
<path d="M -92.42,-79.11 C -89.97,243.8 -87.52,566.7 -85.07,889.6 201.8,889.9 488.7,889.9 775.5,895.6 880.4,896.9 985.2,894 1090,892.5 1064,773.3 1037,651.6 976.1,544.8 946.7,495.8 914.6,448.3 882,401.3 820.9,314.4 742.3,252 666.4,177.4 583.2,98.01 496.5,12.18 386.7,-23.38 328.4,-45.64 232.6,-81.38 232.6,-81.38 232.6,-81.38 9.82,-84.94 -92.42,-79.11 Z" pathdata:id="M -92.42,-79.11 C -89.97,243.8 -87.52,566.7 -85.07,889.6 201.8,889.9 488.7,889.9 775.5,895.6 880.4,896.9 1063,889.5 1063,889.5 1063,889.5 1081,768.2 997.4,608.7 958.5,534.8 969.9,436.8 918.5,370.8 848.4,280.8 717,260.3 629.9,186.5 552.6,121.2 491.5,38.73 426.3,-38.61 412.9,-54.44 387.9,-87.47 387.9,-87.47 387.9,-87.47 9.82,-84.94 -92.42,-79.11 Z"></path>
<path d="M -88.6,95.54 C -90.38,166.1 -88.23,236.7 -88.68,307.4 L -86.19,890 C 229.7,890.2 939.8,892.4 939.8,892.4 855.2,767 831,639.4 721.4,519.4 634.7,424.5 526.4,360.9 428.8,281.8 332.7,204 251.6,102.3 140.1,48.9 70.75,15.73 -24.82,24.2 -85.28,0.03 Z" pathdata:id="M -88.6,95.54 C -90.38,166.1 -88.23,236.7 -88.68,307.4 L -86.19,890 C 229.7,890.2 939.8,892.4 939.8,892.4 906.9,734.7 779.3,676 721.4,519.4 676.8,398.8 566.5,307.1 458.9,236.6 355.2,168.7 220.3,165.7 107.8,113.5 40.05,82.12 -24.82,24.2 -85.28,0.03 Z"></path>
<path d="M -95.69,252.3 -87.65,890.4 698.1,892 C 698.1,892 599.1,687.7 518.9,610.6 348,446.2 131.4,466.5 -95.69,252.3 Z" pathdata:id="M -95.69,252.3 -87.65,890.4 698.1,892 C 698.1,892 569.8,587.1 448.9,482.7 299.7,353.9 131.4,466.5 -95.69,252.3 Z"></path>	
<path d="M -85.59,444.4 -85.59,890.6 489,895.6 C 489,895.6 436.8,745.3 382.5,690.8 258.1,565.8 57.98,629.2 -85.59,444.4 Z" pathdata:id="M -85.59,444.4 -85.59,890.6 546.9,895.6 C 546.9,895.6 517.4,695.4 339.9,593.4 187.7,505.9 57.98,629.2 -85.59,444.4 Z"></path>
</svg>
!

CSS 

              
                * {
	margin: 0;
	padding: 0;
}

body {
	overflow: hidden;
}

.bg {
	background: #f7f7f7;
}

.bg path:first-child {
	opacity: 0.15;
}

.bg path:nth-child(2) {
	opacity: 0.15;
}

.bg path:nth-child(3) {
	opacity: 0.15;
}

.bg path:nth-child(4) {
	opacity: 0.15;
}

.bg path:nth-child(5) {
	opacity: 0.15;
}

.bg path:nth-child(6) {
	opacity: 0.15;
}

.bg path:nth-child(7) {
	opacity: 0.15;
}
!

JS 

              
                class MorphingBG {
	constructor(el) {
		this.DOM = {};
		this.DOM.el = el;
		this.DOM.paths = Array.from(this.DOM.el.querySelectorAll('path'));
		this.animate();
	}
	animate() {
		this.DOM.paths.forEach((path) => {
			setTimeout(() => {
				anime({
					targets: path,
					duration: anime.random(3000,4000),
					easing: [0.5,0,0.5,1],
					d: path.getAttribute('pathdata:id'),
					loop: true,
					direction: 'alternate'
				});
			}, 
			anime.random(0,1000));
		});
	}
};
new MorphingBG(document.querySelector('svg.bg'));
!
999px

Console