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              <div class="alert success">success message</div>
<div class="alert warning">warning message</div></br>
<div class="alert error">error message</div></br>
<div class="alert info">info message</div>

              /* 基本の部分であるalertを定義 */
  border: 2px solid #333;
  border-right: 6px;
  padding: 10px;
  background-color: #fff;
  font-weight: bold;
  font-size: 16px;
  color: 333px;
/* それぞれのバリエーションを追加 */
  border-color: #494;
  background-color: rgba(68, 153, 68,0.3);
  border-color: #dd0;
  background-color: rgba(221, 221, 0,0.3);
  border-color: #c44;
  background-color: rgba(204, 68, 68,0.3);
  border-color: #48c;
  background-color: rgba(68, 136, 204, 0.3);
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