.loading {
    width: 80px;
    height: 40px;
    z-index: 999;
    position:absolute;
    left: 20px;
    right: 0;
    top: 0px;
    bottom: 0;
    margin: auto;

}

    .loading span {
        display: inline-block;
        width: 8px;
        height: 100%;
        border-radius: 4px;
        background: lightgreen;
        -webkit-animation: load 1s ease infinite;
        animation: load 1s ease infinite;
    }

@-webkit-keyframes load {
    0%,100% {
        height: 40px;
        background: lightgreen;
    }

    50% {
        height: 70px;
        margin: -15px 0;
        background: lightblue;
    }
}

.loading span:nth-child(2) {
    -webkit-animation-delay: 0.2s;
    animation-delay: 0.2s;
}

.loading span:nth-child(3) {
    -webkit-animation-delay: 0.4s;
    animation-delay: 0.4s;
}

.loading span:nth-child(4) {
    -webkit-animation-delay: 0.6s;
    animation-delay: 0.6s;
}

.loading span:nth-child(5) {
    -webkit-animation-delay: 0.8s;
    animation-delay: 0.8s;
}