body {
    margin: 0;
    background: #1E1E1E;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}
.rect {
    width: 80vw;
    min-width: 528px;
    /* background: #fff;
    box-shadow: 0 4px 12px rgba(0,0,0,0.5); */
    text-align: center;
}
.rect .container {
    display: flex;
    flex-wrap: wrap;
    width: 100%;
    height: 128px;              /* parent has explicit height */
    align-items: flex-end;     /* bars grow upward */
}
.rect .box {
    height: 100px;                /* JS controls height */
    background: #333;
    border-radius: 8px;
    flex: 1;
    margin: calc((100% / 97) * 0.1);
}
.rect .spacer {
    height: 100px;
    width: calc((100% / 97) * 0.5);
}
.rect span {
    font-size: 36px;
    font-family: Impact, Haettenschweiler, 'Arial Narrow Bold', sans-serif;
    color: #ccc;
    margin-top: 16px;
    display: inline-block;
}