.bars-top {
    position: absolute;
    top: -5px;
    left: -5px;
    display: flex;
    flex-direction: row;
    z-index: -1;
}

.bars-bottom {
    position: absolute;
    /* bottom of the whole page */
    bottom: -5px;
    right: 0;
    display: flex;
    flex-direction: row;
    /* rotate */
    transform: rotate(180deg);
}

.bar {
    height: 150px;
    width: 40px;
    border-radius: 0 0 5px 5px;
    background-color: #1DB954;
    margin-right: 10px;
}

.bar-1 {
    background-color: #e9554a;
    animation: bar-1 1.2s infinite alternate;
}

.bar-2 {
    background-color: #ffe309;
    animation: bar-2 1.4s infinite alternate;
}

.bar-3 {
    background-color: #56b585;
    animation: bar-3 1.7s infinite alternate;
}

.bar-4 {
    background-color: #4660a9;
    animation: bar-4 2s infinite alternate;
}

@keyframes bar-1 {
    0% {
        height: 200px;
    }
    100% {
        height: 100px;
    }
}

@keyframes bar-2 {
    0% {
        height: 150px;
    }
    100% {
        height: 50px;
    }
}

@keyframes bar-3 {
    0% {
        height: 150px;
    }
    100% {
        height: 100px;
    }
}

@keyframes bar-4 {
    0% {
        height: 170px;
    }
    100% {
        height: 75px;
    }
}

/* desktop medai break  */
@media screen and (min-width: 768px){
    .bar {
        scale: 1.5;
        margin-right: 40px;
    }
}