.main_div {
    /* width: 100vw; */
    /* height: 100vh; */
    /* background-color: #222f3e; */
    display: flex;
    justify-content: center;
    align-items: center;
}

.wave {
    width: 0.4rem;
    height: 6rem;
    background: #fff;
    margin: 0 0.4rem;
    border-radius: 0.4rem;
    animation: wave 1s linear infinite;
    transform-origin: bottom;
    transition: all 0.5s linear;
}


@keyframes wave {
    0% {
        transform: scale(0);
    }

    50% {
        transform: scale(1);
    }

    100% {
        transform: scale(0);
    }
}

.wave:nth-child(1) {
    animation-delay: 0.1s;
}

.wave:nth-child(2) {
    animation-delay: 0.2s;
}

.wave:nth-child(3) {
    animation-delay: 0.3s;
}

.wave:nth-child(4) {
    animation-delay: 0.4s;
}

.wave:nth-child(5) {
    animation-delay: 0.5s;
}

.wave:nth-child(6) {
    animation-delay: 0.6s;
}

.wave:nth-child(7) {
    animation-delay: 0.7s;
}

.wave:nth-child(8) {
    animation-delay: 0.8s;
}

.wave:nth-child(9) {
    animation-delay: 0.9s;
}

.wave:nth-child(10) {
    animation-delay: 1s;
}
.wave:nth-child(11) {
    animation-delay:0.1s;
}
.wave:nth-child(12) {
    animation-delay: 0.2s;
}
.wave:nth-child(13) {
    animation-delay: 0.3s;
}
.wave:nth-child(14) {
    animation-delay: 0.4s;
}
.wave:nth-child(15) {
    animation-delay: 0.5s;
}
.wave:nth-child(16) {
    animation-delay: 0.6s;
}
.wave:nth-child(17) {
    animation-delay: 0.7s;
}
.wave:nth-child(18) {
    animation-delay: 0.8s;
}