position: relative;
  width: 42rem;
  height: 3rem;
  background-color: #d0d4d3;
  box-shadow: 0 0 6px 0px #d0d4ee;
  border: 2px dashed #555;  //虚线
  border-radius: 10px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: 0.8rem 1rem;
  margin-bottom: 2rem;

  // hover 增加透明度
  &:hover {
    opacity: 0.6;
  }