<div class="preloaderbar show active">      <span class="bar"></span>
</div>

.preloaderbar {
    z-index: 1;
    position: absolute;
    top: 50px;
    left: 0;
    right: 0;
    height: 4px;
    margin-bottom: -4px
}

.preloaderbar .bar {
    position: absolute;
    width: 100%;
    height: 0;
    text-indent: -9999px;
    background-color: #23b7e5
}

.preloaderbar .bar:before {
    position: absolute;
    right: 50%;
    left: 50%;
    height: 4px;
    background-color: inherit;
    content: ""
}

.preloaderbar.active {
    -webkit-animation: changebar 2.25s infinite 0.75s;
    -moz-animation: changebar 2.25s infinite 0.75s;
    animation: changebar 2.25s infinite 0.75s;
}

.preloaderbar.active .bar {
    -webkit-animation: changebar 2.25s infinite;
    -moz-animation: changebar 2.25s infinite;
    animation: changebar 2.25s infinite;
}

.preloaderbar.active .bar:before {
    -webkit-animation: movingbar 0.75s infinite;
    -moz-animation: movingbar 0.75s infinite;
    animation: movingbar 0.75s infinite
}

@-webkit-keyframes movingbar {
    0% {
        right: 50%;
        left: 50%
    }

    99.9% {
        right: 0;
        left: 0
    }

    100% {
        right: 50%;
        left: 50%
    }
}

@-moz-keyframes movingbar {
    0% {
        right: 50%;
        left: 50%
    }

    99.9% {
        right: 0;
        left: 0
    }

    100% {
        right: 50%;
        left: 50%
    }
}

@keyframes movingbar {
    0% {
        right: 50%;
        left: 50%
    }

    99.9% {
        right: 0;
        left: 0
    }

    100% {
        right: 50%;
        left: 50%
    }
}

@-webkit-keyframes changebar {
    0% {
        background-color: #8BC34A
    }

    33.3% {
        background-color: #8BC34A
    }

    33.33% {
        background-color: #FFCA28
    }

    66.6% {
        background-color: #FFCA28
    }

    66.66% {
        background-color: #F44336
    }

    99.9% {
        background-color: #F44336
    }
}

@-moz-keyframes changebar {
    0% {
        background-color: #8BC34A
    }

    33.3% {
        background-color: #8BC34A
    }

    33.33% {
        background-color: #FFCA28
    }

    66.6% {
        background-color: #FFCA28
    }

    66.66% {
        background-color: #F44336
    }

    99.9% {
        background-color: #F44336
    }
}

@keyframes changebar {
    0% {
        background-color: #8BC34A
    }

    33.3% {
        background-color: #8BC34A
    }

    33.33% {
        background-color: #FFCA28
    }

    66.6% {
        background-color: #FFCA28
    }

    66.66% {
        background-color: #F44336
    }

    99.9% {
        background-color: #F44336
    }
}