.diagram {
    background: rgba(150, 100, 200, 0.1);
    font-size: 10px;
    margin: 0 auto;
    position: relative;
    top: 0;
    width: 700px;
    z-index: 10;
}

.group-tick line {
  stroke: #ddd;
}

.ribbon {
  fill-opacity: 0.4;
  stroke-width: 1;
  stroke-opacity: 0.1;
}

.ribbon:hover {
    fill-opacity: 1;
    stroke-opacity: 1;
}