html {
      line-height: 1.5;
      font-family: Georgia, serif;
      font-size: 20px;
      color: #1a1a1a;
      background-color: #F3EDED;
    }
    body {
      margin: 0 auto;
      max-width: 36em;
      padding-left: 50px;
      padding-right: 50px;
      padding-top: 10px;
      padding-bottom: 50px;
      hyphens: auto;
      word-wrap: break-word;
      text-rendering: optimizeLegibility;
      font-kerning: normal;
    }
    @media (max-width: 600px) {
      body {
        font-size: 0.9em;
        padding: 1em;
      }
    }
    @media print {
      body {
        background-color: transparent;
        color: black;
        font-size: 12pt;
      }
      p, h2, h3 {
        orphans: 3;
        widows: 3;
      }
      h2, h3, h4 {
        page-break-after: avoid;
      }
    }
    p {
      margin: 1em 0;
    }
    a {
      color: #1a1a1a;
    }
    a:visited {
      color: #1a1a1a;
    }
    img {
      max-width: 100%;
    }
    h1, h2, h3, h4, h5, h6 {
      margin-top: 1em;
        margin-bottom: 0px;
    }
    h5, h6 {
      font-size: 1em;
      font-style: italic;
    }
    h6 {
      font-weight: normal;
    }
    ol, ul {
      padding-left: 1.7em;
      margin-top: 1em;
    }
    li > ol, li > ul {
      margin-top: 0;
    }
    blockquote {
      margin: 1em 0 1em 1.7em;
      padding-left: 1em;
      border-left: 2px solid #e6e6e6;
      color: #606060;
    }
    code {
      font-family: Menlo, Monaco, 'Lucida Console', Consolas, monospace;
      font-size: 85%;
      margin: 0;
    }
    pre {
      margin: 1em 0;
      overflow: auto;
    }
    pre code {
      padding: 0;
      overflow: visible;
    }
    .sourceCode {
     background-color: transparent;
     overflow: visible;
    }
    hr {
      background-color: #1a1a1a;
      border: none;
      height: 1px;
      margin: 1em 0;
    }
    table {
      margin: 1em 0;
      border-collapse: collapse;
      width: 100%;
      overflow-x: auto;
      display: block;
      font-variant-numeric: lining-nums tabular-nums;
    }
    table caption {
      margin-bottom: 0.75em;
    }
    tbody {
      margin-top: 0.5em;
      border-top: 1px solid #1a1a1a;
      border-bottom: 1px solid #1a1a1a;
    }
    th {
      border-top: 1px solid #1a1a1a;
      padding: 0.25em 0.5em 0.25em 0.5em;
    }
    td {
      padding: 0.125em 0.5em 0.25em 0.5em;
    }
    header {
      margin-bottom: 4em;
      text-align: center;
    }
    #TOC li {
      list-style: none;
    }
    #TOC a:not(:hover) {
      text-decoration: none;
    }
    code{white-space: pre-wrap;}
    span.smallcaps{font-variant: small-caps;}
    span.underline{text-decoration: underline;}
    div.column{display: inline-block; vertical-align: top; width: 50%;}
    div.hanging-indent{margin-left: 1.5em; text-indent: -1.5em;}
    ul.task-list{list-style: none;}
    .display.math{display: block; text-align: center; margin: 0.5rem auto;}

.flex_test-box {
    background-color: #eee;     /* 背景色指定 */
    padding:  10px;             /* 余白指定 */
    display: flex;              /* フレックスボックスにする */
    flex-wrap: nowrap;            /* 折り返し指定 */
}
 
.flex_test-item {
    padding: 10px;
    color:  #fff;               /* 文字色 */
    margin:  10px;              /* 外側の余白 */
    border-radius:  5px;        /* 角丸指定 */
    font-size:  15px;           /* 文字サイズ */
    width: 200px;               /* 幅指定 */
    text-align:  center;        /* 文字中央揃え */
}
 
.flex_test-item:nth-child(1) {
    background-color:  #EFC8CD; /* 背景色指定 */
}
 
.flex_test-item:nth-child(2) {
    background-color:  #EFC8CD; /* 背景色指定 */
}
 
.flex_test-item:nth-child(3) {
    background-color: #EFC8CD; /* 背景色指定 */
}
 
.flex_test-item:nth-child(4) {
    background-color:  #EFC8CD; /* 背景色指定 */
}
.flex_test-item:nth-child(5) {
    background-color:  #EFC8CD; /* 背景色指定 */
}
.flex_test-item:nth-child(6) {
    background-color:  #EFC8CD; /* 背景色指定 */
}
.flex_test-item:nth-child(7) {
    background-color:  #EFC8CD; /* 背景色指定 */
}