div {
    width: 200px;
    padding: 20px;
    text-align: center;
    font-weight: bold;
    font-size: 25px;
    background-color: #909;
    color: #FFF;
    border-radius: 10px;
    margin: 100px 0px;
    position: relative;

    /* Animation */
    animation: ani 5s linear 1s 2 alternate;
}

/* Keyframes gồm 5 mốc */
@keyframes ani {
    0% {
        background-color: #909;
        left: 0px;
    }

    25% {
        background-color: #C3F;
        left: 20%;
    }

    50% {
        background-color: #F9F;
        left: 40%;
        transform: rotate(180deg);
    }

    75% {
        background-color: #F6F;
        left: 60%;
    }

    100% {
        background-color: #F0F;
        left: 85%;
    }
}