h1 {
    color: #878787;
  }

input[type="submit"] {
    background-color: blue;
    font-size: 20px;
    color: white;
    border: 1px solid darkblue;
    padding: 10px 20px;
    cursor: pointer; /* カーソルを手の形に変更 */
  }

.flexbox {
    display: flex;
    flex-wrap: nowrap;
    flex-direction: column;
    align-items: flex-start;
    text-align: left;
    margin-left: 10px;
  }

select {
    font-size: 20px;
    height: 30px;
    width: 80px;
  }