.hover-box {
    width: 200px;
    height: 200px;
    background-color: lightgray;
    transition: all 0.3s ease; /* 使變化更平滑 */
  }

  .hover-box:hover {
    border: 2px solid blue; /* 滑鼠懸停時顯示藍色邊框 */
  }