CSS for: http://jarqu.es/dev/ios7-loader/

gistfile1.css

.progress {
    width: 400px;
}
.bar {
    background: #e5e9eb;
    height: 6px;
    position: relative;
}
.bar .percentage {
    background: -webkit-gradient(linear, left top, right top,
                    color-stop(0%,#01dcd7),
                    color-stop(23%,#086df2),
                    color-stop(50%,#11a1e3),
                    color-stop(78%,#9350ad),
                    color-stop(100%,#fb4a71));
    background-size: 400px 5px;
    height: 4px;
    position: relative;
    width: 0;
    transition: width 3s cubic-bezier(1,0,.62,.86);
}
.bar .percentage .shadow {
    position: absolute;
    top: 0px;
    width: 100%;
    height: 75px;
    left: 35px;
    -webkit-transform: skew(45deg);
    -webkit-backface-visibility: hidden;
    background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,rgba(0,0,0,0.05)), color-stop(100%,rgba(252,252,252,0)));
}