CSS Tutorial: Creating a Dynamic Gradient Bar

I am looking to create a dynamic colored bar with a moving color gradient effect. Without using JavaScript, I want to achieve this effect using CSS 3 properties such as gradients and animations.

This is a snippet of what I have tried so far:

HTML:

<body>
    <div class="navbar_line"></div>
</body>

CSS:

.navbar_line {
animation: gradient 5s linear infinite; 
}
@-webkit-keyframes gradient
{
0% {
background: -moz-linear-gradient(left, #FFFFFF 0%, #EEFFEE 1%, #DDFFDD... /* Gradient color stops */
}

1% {
background: -moz-linear-gradient(left, #EEFFEE 0%, #FFFFFF 1%, #EEFFEE... /* Gradient color stops */
}

2% {
background: -moz-linear-gradient(left, #DDFFDD 0%, #EEFFEE 1%, #FFFFFF ... /* Gradient color stops */
}

/* More animation keyframes go here */

}

To be continued...

Surprisingly, my initial attempt was successful in creating the desired effect. However, the script generated is too large and impractical for use. I am open to exploring more efficient methods to achieve this effect.

Answer №1

Creating the HTML section is a breeze, requiring only two distinct divs.

HTML:

<body>
    <div class="background">
        <div class="movement"></div>
    </div>
</body>

CSS:

.movement 
{
    background: -webkit-linear-gradient(left, rgba(255, 255, 255, 0) 0%, rgba(0,255,0,0.7) 25%, white 50%, rgba(0,255,0,0.7) 75%, rgba(255, 255, 255, 0) 100%); 
    background: -o-linear-gradient(right,  rgba(255, 255, 255, 0) 0%, rgba(0,255,0,0.7) 25%, white 50%, rgba(0,255,0,0.7) 75%, rgba(255, 255, 255, 0) 100%); 
    background: -moz-linear-gradient(right, rgba(255, 255, 255, 0) 0%, rgba(0,255,0,0.7) 25%, white 50%, rgba(0,255,0,0.7) 75%, rgba(255, 255, 255, 0) 100%);
    background: linear-gradient(to right, rgba(255, 255, 255, 0) 0%, rgba(0,255,0,0.7) 25%, white 50%, rgba(0,255,0,0.7) 75%, rgba(255, 255, 255, 0) 100%); 
    width: 400px; 
    height: 5px; 
    position: relative;
    -webkit-animation: gradient 6s linear infinite;
    animation: gradient 6s linear infinite;
}
.background 
{
    width: 1000px;
    overflow: hidden;
    height: 5px;
    background-color: #070;
}
@-webkit-keyframes gradient
{
    0%   {left: -400px;}
    100% {left: 1000px;}
}
@keyframes gradient 
{
    0%   {left: -400px;}
    100% {left: 1000px;}
}

The purpose of the background div is simply for setting the background color and size.

The second div, called the gradient div, is where your secondary color gradient is applied. This div is animated to move over the background.

And that's it! Experiment with it here: http://jsfiddle.net/fgeLnbkm/2/

If you wish to customize it, most elements are straightforward to modify, except for the gradient of the movement div.

Answer №2

  1. Opt for radial-gradient over linear-gradient to simplify the process with only 5 color stops instead of a hundred.
  2. Simplify your animation by using just three keyframes: 0%, 50%, and 100% (or even just 2). The values in between will be automatically interpolated.

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