SOURCE

<div class="footerWave">
	<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 24 150 28" preserveAspectRatio="none">
		<defs>
			<path id="gentle-wave" d="M-160 44c30 0 58-18 88-18s 58 18 88 18 58-18 88-18 58 18 88 18 v44h-352z"></path>
		</defs>
		<g class="wave-g">
			<use xlink:href="#gentle-wave" x="50" y="0" fill="#7030A0"></use>
			<use xlink:href="#gentle-wave" x="50" y="3" fill="#7030A0"></use>
			<use xlink:href="#gentle-wave" x="50" y="6" fill="#7030A0"></use>
		</g>
	</svg>
</div>

.footerWave {
    height: 120px;
    z-index: 2;
}

.footerWave>svg {
    display: block;
    width: 100%;
    height: 100%;
}

.footerWave .wave-g>use {
    animation: move-forever 12s linear infinite;
}

.footerWave .wave-g>use:nth-child(1) {
    animation-delay: -2s;
    opacity: .5;
}

.footerWave .wave-g>use:nth-child(2) {
    animation-delay: -2s;
    animation-duration: 6s;
    opacity: .7;
}

.footerWave .wave-g>use:nth-child(3) {
    animation-delay: -4s;
    animation-duration: 3s;
}

@keyframes move-forever {
    0% {
        transform: translate(-90px, 0%);
    }
    100% {
        transform: translate(85px, 0%);
    }
}