.load-bar {
    position: relative;
    margin-top: 20px;
    width: 100%;
    height: 6px;
    background-color: transparent;
}
.bar {
    content: "";
    display: inline;
    position: absolute;
    width: 0;
    height: 100%;
    left: 50%;
    text-align: center;
}
.bar:nth-child(1) {
    background-color: #3549ff;
    animation: loading 3s linear infinite;
}
.bar:nth-child(2) {
    background-color: #3549ff;
    animation: loading 3s linear 1s infinite;
}
.bar:nth-child(3) {
    background-color: #ffa800;
    animation: loading 3s linear 2s infinite;
}
@keyframes loading {
    from {left: 50%; width: 0;z-index:100;}
    33.3333% {left: 0; width: 100%;z-index: 10;}
    to {left: 0; width: 100%;}
}