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This is file  HTML  :

<div id="parallax">
	<div class="layer" data-depth="0.6">
		<div class="some-space">
			<h1>PARALLAX</h1>
		</div>
	</div>
	<div class="layer" data-depth="0.4">
		<div id="particles-js"></div>
	</div>
	<div class="layer" data-depth="0.3">
		<div class="some-more-space">
			<a href="#">Hit me.</a>
		</div>
	</div>
</div>

You need to conect with  cdn library  :

<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css">
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js'></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/particles.js/2.0.0/particles.min.js'></script>
<script src='https://matthew.wagerfield.com/parallax/deploy/jquery.parallax.js'></script>

This is file  CSS  :

@import url(https://fonts.googleapis.com/css?family=Lato:400,300,100);

        body {
            font-family: "Lato";
            background: #252729;
            overflow: hidden;
            height: 100%;
            width: 100%;
            -webkit-font-smoothing: antialiased;
            -webkit-user-select: none;
            -moz-user-select: none;
            -ms-user-select: none;
            user-select: none;
        }

        #particles-js,
        #parallax,
        .layer,
        .some-space,
        .some-more-space {
            height: 100%;
            position: absolute;
            width: 100%;
        }

        #particles-js {
            opacity: 0.6;
        }

        h1 {
            color: white;
            font-size: 5em;
            font-weight: 100;
            letter-spacing: 0.2em;
            position: absolute;
            top: 50%;
            left: 50%;
            -webkit-transform: translate3d(-50%, -50%, 0);
            transform: translate3d(-50%, -50%, 0);
        }

        a {
            color: white;
            border: 1px solid white;
            display: table;
            position: absolute;
            top: 60%;
            left: 50%;
            letter-spacing: 0.05em;
            -webkit-transform: translate3d(-50%, -50%, 0);
            transform: translate3d(-50%, -50%, 0);
            text-decoration: none;
            -webkit-transition: all 200ms ease;
            transition: all 200ms ease;
            padding: 10px 15px;
        }

        a:hover {
            background: white;
            color: black;
        }

        .some-space {
            animation: rotate 18s 0.5s infinite linear reverse;
        }

        .some-more-space {
            -webkit-animation: rotate 15s 0.1s infinite linear;
            animation: rotate 15s 0.1s infinite linear;
        }

        @-webkit-keyframes rotate {
            0% {
                -webkit-transform: rotateZ(0deg) translate3d(0, 1.5%, 0) rotateZ(0deg);
                transform: rotateZ(0deg) translate3d(0, 1.5%, 0) rotateZ(0deg);
            }

            100% {
                -webkit-transform: rotateZ(360deg) translate3d(0, 1.5%, 0) rotateZ(-360deg);
                transform: rotateZ(360deg) translate3d(0, 1.5%, 0) rotateZ(-360deg);
            }
        }

        @keyframes rotate {
            0% {
                -webkit-transform: rotateZ(0deg) translate3d(0, 1.5%, 0) rotateZ(0deg);
                transform: rotateZ(0deg) translate3d(0, 1.5%, 0) rotateZ(0deg);
            }

            100% {
                -webkit-transform: rotateZ(360deg) translate3d(0, 1.5%, 0) rotateZ(-360deg);
                transform: rotateZ(360deg) translate3d(0, 1.5%, 0) rotateZ(-360deg);
            }
        }