RGB Line, как сделать?

[1ws3echt4]

Как сделать переливающуюся цветами радуги линию на сайте?

 

[Rezy1337]

.rainbowline {
    padding: 0;
    margin: 0;
    margin-bottom: 30px;
    background: #1e5799;
    background: -moz-linear-gradient(left,  #1e5799 0%, #f300ff 50%, #e0ff00 100%);
    background: -webkit-gradient(linear, left top, right top, color-stop(0%,#1e5799), color-stop(50%,#f300ff), color-stop(100%,#e0ff00));
    background: -webkit-linear-gradient(left,  #1e5799 0%,#f300ff 50%,#e0ff00 100%);
    background: -o-linear-gradient(left,  #1e5799 0%,#f300ff 50%,#e0ff00 100%);
    background: -ms-linear-gradient(left,  #1e5799 0%,#f300ff 50%,#e0ff00 100%);
    background: linear-gradient(to right,  #1e5799 0%,#f300ff 50%,#e0ff00 100%);
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#1e5799', endColorstr='#e0ff00',GradientType=1 );
    height: 3px;
    border-bottom: 1px solid #000;
}

<div class="rainbowline"></div>

 

[1ws3echt4]

.rainbowline {
    padding: 0;
    margin: 0;
    margin-bottom: 30px;
    background: #1e5799;
    background: -moz-linear-gradient(left,  #1e5799 0%, #f300ff 50%, #e0ff00 100%);
    background: -webkit-gradient(linear, left top, right top, color-stop(0%,#1e5799), color-stop(50%,#f300ff), color-stop(100%,#e0ff00));
    background: -webkit-linear-gradient(left,  #1e5799 0%,#f300ff 50%,#e0ff00 100%);
    background: -o-linear-gradient(left,  #1e5799 0%,#f300ff 50%,#e0ff00 100%);
    background: -ms-linear-gradient(left,  #1e5799 0%,#f300ff 50%,#e0ff00 100%);
    background: linear-gradient(to right,  #1e5799 0%,#f300ff 50%,#e0ff00 100%);
    filter: progid:DXImageTransform.Microsoft.gradient( startColorstr='#1e5799', endColorstr='#e0ff00',GradientType=1 );
    height: 3px;
    border-bottom: 1px solid #000;
}

<div class="rainbowline"></div>

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