styles.css

body {
    text-align: center;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

#my-container {
    display: flex;
    justify-content: center;
    margin: 1em;
    height: 65vh;
}

#control-panel {
    display: flex;
    justify-content: center;
    margin: 1em;
}

.button-6 {
    align-items: center;
    background-color: #FFFFFF;
    border: 1px solid rgba(0, 0, 0, 0.1);
    border-radius: .25rem;
    box-shadow: rgba(0, 0, 0, 0.02) 0 1px 3px 0;
    box-sizing: border-box;
    color: rgba(0, 0, 0, 0.85);
    cursor: pointer;
    display: inline-flex;
    font-family: system-ui, -apple-system, system-ui, "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 16px;
    font-weight: 600;
    justify-content: center;
    line-height: 1.25;
    margin: 1em;
    min-height: 3rem;
    padding: calc(.875rem - 1px) calc(1.5rem - 1px);
    position: relative;
    text-decoration: none;
    transition: all 250ms;
    user-select: none;
    -webkit-user-select: none;
    touch-action: manipulation;
    vertical-align: baseline;
    width: auto;
}

.button-6:hover,
.button-6:focus {
    border-color: rgba(0, 0, 0, 0.15);
    box-shadow: rgba(0, 0, 0, 0.1) 0 4px 12px;
    color: rgba(0, 0, 0, 0.65);
}

.button-6:hover {
    transform: translateY(-1px);
}

.button-6:active {
    background-color: #F0F0F1;
    border-color: rgba(0, 0, 0, 0.15);
    box-shadow: rgba(0, 0, 0, 0.06) 0 2px 4px;
    color: rgba(64, 64, 64, 0.65);
    transform: translateY(0);
}

.button-6:disabled {
    background-color: #FFFFFF;
    box-shadow: rgba(0, 0, 0, 0.02) 0 1px 3px 0;
    color: rgba(0, 0, 0, 0.5);
    transform: none;
}

.bars {
    border-radius: .25rem;
    background-color: blue;
    width: 1em;
    margin: 1px;
    align-self: flex-end;
}

#id-5 {
    background-color: red;
}