.time-line {
  position: absolute;
  top: 10px;
  left: 20px;
  width: 30px;
  height: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  background-color: #fff;
  background-image: linear-gradient(to bottom, #008000 50%, transparent 50%);
  background-size: 1px 5px;
  background-position: center;
  background-repeat: repeat-y;
}
.time-line .start-circle {
  width: 30px;
  height: 30px;
  background-color: #008000;
  border-radius: 50%;
  border: 5px solid #efefef;
}

.flow-item:last-child .time-line {
  background-image: none;
}