var colors = new Array(
[62,35,255],
[60,255,60],
[255,35,98],
[45,175,230],
[255,0,255],
[255,128,0]);
var step = 0;
//color table indices for:
// current color left
// next color left
// current color right
// next color right
var colorIndices = [0,1,2,3];
//transition speed
var gradientSpeed = 0.002;
function updateGradient()
{
if ($===undefined) return;
var c0_0 = colors[colorIndices[0]];
var c0_1 = colors[colorIndices[1]];
var c1_0 = colors[colorIndices[2]];
var c1_1 = colors[colorIndices[3]];
var istep = 1 - step;
var r1 = Math.round(istep * c0_0[0] + step * c0_1[0]);
var g1 = Math.round(istep * c0_0[1] + step * c0_1[1]);
var b1 = Math.round(istep * c0_0[2] + step * c0_1[2]);
var color1 = "rgb("+r1+","+g1+","+b1+")";
var r2 = Math.round(istep * c1_0[0] + step * c1_1[0]);
var g2 = Math.round(istep * c1_0[1] + step * c1_1[1]);
var b2 = Math.round(istep * c1_0[2] + step * c1_1[2]);
var color2 = "rgb("+r2+","+g2+","+b2+")";
$('#gradient').css({
background: "-webkit-gradient(linear, left top, right top, from("+color1+"), to("+color2+"))"}).css({
background: "-moz-linear-gradient(left, "+color1+" 0%, "+color2+" 100%)"});
step += gradientSpeed;
if (step >= 1)
{
step %= 1;
colorIndices[0] = colorIndices[1];
colorIndices[2] = colorIndices[3];
//pick two new target color indices
//do not pick the same as the current one
colorIndices[1] = (colorIndices[1] + Math.floor(1 + Math.random() * (colors.length - 1))) % colors.length;
colorIndices[3] = (colorIndices[3] + Math.floor(1 + Math.random() * (colors.length - 1))) % colors.length;
}
}
setInterval(updateGradient,10);
/*
* Globals
*/
/* Links */
a,
a:focus,
a:hover {
color: #fff;
}
/* Custom default button */
.btn-default,
.btn-default:hover,
.btn-default:focus {
color: #333;
text-shadow: none; /* Prevent inheritance from `body` */
background-color: #fff;
border: 1px solid #fff;
}
/*
* Base structure
*/
html,
body {
height: 100%;
background-color: #333;
}
body {
color: #fff;
text-align: center;
text-shadow: 0 1px 3px rgba(0,0,0,.5);
}
/* Extra markup and styles for table-esque vertical and horizontal centering */
.site-wrapper {
display: table;
width: 100%;
height: 100%; /* For at least Firefox */
min-height: 100%;
-webkit-box-shadow: inset 0 0 100px rgba(0,0,0,.5);
box-shadow: inset 0 0 100px rgba(0,0,0,.5);
}
.site-wrapper-inner {
display: table-cell;
vertical-align: top;
}
.cover-container {
margin-right: auto;
margin-left: auto;
}
/* Padding for spacing */
.inner {
padding: 30px;
}
/*
* Header
*/
.masthead-brand {
margin-top: 10px;
margin-bottom: 10px;
}
.masthead-nav > li {
display: inline-block;
}
.masthead-nav > li + li {
margin-left: 20px;
}
.masthead-nav > li > a {
padding-right: 0;
padding-left: 0;
font-size: 16px;
font-weight: bold;
color: #fff; /* IE8 proofing */
color: rgba(255,255,255,.75);
border-bottom: 2px solid transparent;
}
.masthead-nav > li > a:hover,
.masthead-nav > li > a:focus {
background-color: transparent;
border-bottom-color: #a9a9a9;
border-bottom-color: rgba(255,255,255,.25);
}
.masthead-nav > .active > a,
.masthead-nav > .active > a:hover,
.masthead-nav > .active > a:focus {
color: #fff;
border-bottom-color: #fff;
}
@media (min-width: 768px) {
.masthead-brand {
float: left;
}
.masthead-nav {
float: right;
}
}
/*
* Cover
*/
.cover {
padding: 0 20px;
}
.cover .btn-lg {
padding: 10px 20px;
font-weight: bold;
}
/*
* Footer
*/
.mastfoot {
color: #999; /* IE8 proofing */
color: rgba(255,255,255,.5);
}
/*
* Affix and center
*/
@media (min-width: 768px) {
/* Pull out the header and footer */
.masthead {
position: fixed;
top: 0;
}
.mastfoot {
position: fixed;
bottom: 0;
}
/* Start the vertical centering */
.site-wrapper-inner {
vertical-align: middle;
}
/* Handle the widths */
.masthead,
.mastfoot,
.cover-container {
width: 100%; /* Must be percentage or pixels for horizontal alignment */
}
}
@media (min-width: 992px) {
.masthead,
.mastfoot,
.cover-container {
width: 700px;
}
}
#gradient {
width: 100%;
height: 100vh;
}
<link href="https://getbootstrap.com/dist/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://getbootstrap.com/dist/js/bootstrap.min.js"></script>
<div id="gradient">
<div class="site-wrapper">
<div class="site-wrapper-inner">
<div class="cover-container">
<div class="masthead clearfix">
<div class="inner">
<h3 class="masthead-brand">Cover</h3>
<nav>
<ul class="nav masthead-nav">
<li class="active"><a href="#">Home</a></li>
<li><a href="#">Features</a></li>
<li><a href="#">Contact</a></li>
</ul>
</nav>
</div>
</div>
<div class="inner cover">
<h1 class="cover-heading">Cover your page.</h1>
<p class="lead">Cover is a one-page template for building simple and beautiful home pages. Download, edit the text, and add your own fullscreen background photo to make it your own.</p>
<p class="lead">
<a href="#" class="btn btn-lg btn-default">Learn more</a>
</p>
</div>
<div class="mastfoot">
<div class="inner">
<p>Cover template for <a href="http://getbootstrap.com">Bootstrap</a>, by <a href="https://twitter.com/mdo">@mdo</a>.</p>
</div>
</div>
</div>
</div>
</div>
</div>
男はあなたのコードを追加スニペット、それは簡単に解決できるように –
この[* 'Codepen' *](http://codepen.io/vivekkupadhyay/pen/bwNWNo)をチェックすると、それが役に立ちます。 – vivekkupadhyay