body {
    margin: 0;
    padding: 0;
  
}

.loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    height: 40px;
    display: flex;
    align-items: center;
}

.obj {
    width: 5px;
    height: 40px;
    background: #2980b9;
    margin: 0 3px;
    border-radius: 10px;
    animation: loading 0.8s infinite;
}

    .obj:nth-child(2) {
        animation-delay: 0.1s;
    }

    .obj:nth-child(3) {
        animation-delay: 0.2s;
    }

    .obj:nth-child(4) {
        animation-delay: 0.3s;
    }

    .obj:nth-child(5) {
        animation-delay: 0.4s;
    }

    .obj:nth-child(6) {
        animation-delay: 0.5s;
    }

    .obj:nth-child(7) {
        animation-delay: 0.6s;
    }

    .obj:nth-child(8) {
        animation-delay: 0.7s;
    }

@keyframes loading {
    0% {
        height: 0;
    }

    50% {
        height: 40px;
    }

    100% {
        height: 0;
    }
}