body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: #f7f7f7;
    overflow: hidden;
}

#wave-container {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 100vw;
    height: 100vh;
    gap: 2px;
}

.bar {
    width: 10px;
    height: 10px; /* base */
    background: #111;
    border-radius: 5px;
    transition: height 0.1s;
}