body {
  background: url(./parts/back.gif);
  background-attachment:fixed;
  background-position: 50% 0%;
}
   .c {
        text-align: center;
    }
    .overlay { /* グレーの背景 */
      position: fixed;
      background: rgba(0, 0, 0, 0);
      transition: all 0.5s 0s ease;
      visibility: hidden;
      opacity: 0;
      top: 0;
      left: 0;
      bottom: 0;
      right: 0;
    }
    #pop-up {
      display: none;
    }
    #pop-up:checked + .overlay {
      visibility: visible;
      opacity: 1;
      z-index: 100000;
      background-color: #000000D0;
      width: 100%;
    }
    .popWindow {
      border-radius: 5px;
      overflow: auto; /* スクロールバー用 */
      max-height: 95%; /* すき間 */
      min-width: fit-content; /* 横幅が広い時に白の部分が大きくならないため */
      max-width: 95%; /* すき間 */
      position: fixed;
      top: 50%; /* 中央に */
      left: 50%; /* 中央に */
      transform: translate(-50%, -50%); /* 中央に */
      z-index: 100010;
      font-size: 13px;
      line-height: 18px;
      margin: 10px auto;
      padding: 4px 10px;
      background: #FFFD; /* 枠の色 */
      text-align: center; /* 文字を中央寄せ */
      transition: all 500ms ease-in-out;
    }
    .popWindow .ptitle {
      font-size: 15px;
      margin: 8px;
      color: #333;
    }
    .popWindow .close {
      position: absolute;
      top: 8px;
      right: 10px;
      transition: all 300ms;
      font-size: 24px;
      line-height: inherit;
      font-weight: bold;
      text-decoration: none;
      color: #000;
      padding: 2px;
    }
    .popWindow .close:hover {
      color: #06D85F;
    }
    .popWindow::-webkit-scrollbar-track {
      background: none;
    }
    .popWindow::-webkit-scrollbar {
      width: 10px;
      height: 10px;
    }
    .popWindow::-webkit-scrollbar-thumb {
      background: #999;
      border-radius: 5px;
    }
    .clickable:hover {
      cursor: pointer;
    }
    @media screen and{
      #pop-up:checked + .overlay {
        visibility: hidden;
        opacity: 0;
      }
    }