Style the Progressbar

The Progressbar style has CSS classes defined. You can customize it by adding these code to your Additional CSS section in the theme customizing:

.twbs .progress {
    background-color: #f5f5f5;
    border-radius: 4px;
}
.twbs .progress-bar {
    background-color: #337ab7;
}
.twbs .progress-meter > .meter > .meter-text {
    color: rgb(160, 160, 160);
}

Choose your own colors and additional styles if needed.