.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(50, 50, 50, 0.7); /* 半透明グレー */
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
  }

  .modal-content {
    background: white;
    padding: 30px;
    border-radius: 10px;
    width: 400px;
    text-align: center;
    position: relative;
    color: rgba(110,110,110,1);
  }

  .modal-content h4 {
    margin-top: 0;
  }

  .modal-close {
    position: absolute;
    top: 5px;
    right: 10px;
    background: none;
    border: none;
    font-size: 20px;
  }

  .modal-button {
    margin-top: 4px;
    background: rgba(0, 136, 255,0.8);
    color: white;
    padding: 2px 10px;
    border-radius: 5px;
    border: none;
    font-size:12px;
  }

  .modal-button:hover {
    background: rgba(0, 136, 255,1);
  }