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<!--   colgroupで列をまとめる -->
<!--     青色の列は3行 -->
    <col span="3" class="blue-column">
<!--     水色の列は1行 -->
    <col span="1" class="lightblue-column">
<!--   中の文字を配置(タイトル) -->
<!-- 行の文字を配置 -->


                /* 外枠と表の余白設定 */
table {
  border: solid 2px gray;
  border-collapse: collapse;

/* colgroupで設定した背景色をそれぞれ設定 */ {
  background: blue;

col.lightblue-column {
  background: lightblue;

/* 表内に枠線を設置 */
/* 文字色は白でセルの大きさ20px */
th, td {
  color: #ffffff;
  padding: 20px;
  border: solid 1px #ffffff;