/* サイドメニューのボタン、下記より拝借。ありがとうございます。
https://saruwakakun.com/html-css/reference/buttons */
.btn-sticky {
    display: inline-block;
    padding: 0.8em 1em;
    text-decoration: none;
    background: #f7f7f7;
    border-left: solid 6px #427e3d;/*左線*/
    color: #000000;/*文字色*/
    font-weight: bold;
    box-shadow: 0px 2px 2px rgba(0, 0, 0, 0.29);
    width: 160px;
    margin: 2px;
  }
  .btn-sticky:active {
    box-shadow: inset 0 0 2px rgba(128, 128, 128, 0.1);
    transform: translateY(2px);
  }
  
  .btn-gradient-3d-simple {
    display: inline-block;
    width: 160px;
    margin: 10pt;
    padding: 0.5em 1em;
    text-decoration: none;
    border-radius: 4px;
    color: #ffffff;
    background-image: linear-gradient(#6795fd 0%, #67ceff 100%);
    box-shadow: 0px 2px 2px rgba(0, 0, 0, 0.29);
    border-bottom: solid 3px #5e7fca;
  }
  
  .btn-gradient-3d-simple:active {
    -webkit-transform: translateY(4px);
    transform: translateY(4px);
    box-shadow: 0px 0px 1px rgba(0, 0, 0, 0.2);
    border-bottom: none;
  }