.pace {
    position: fixed;
    width: 100%;
    height: 4px;
    z-index: 9999;
    visibility: visible;
    opacity: 1;
    top: 0;
    left: 0;
}
.pace:before {
    content: '';
    display: block;
    width: 100%;
    height: 4px;
    background-color: rgba(255, 255, 255, .7);
    position: absolute;
}
.pace-inactive {
    visibility: hidden;
    opacity: 0;
    transition: all 5s;
}
.pace-progress {
    height: 4px;
    z-index: 2;
    position: relative;
    transition: all .2s;
}
.pace-activity {
    display: none;
}