/* 見出し */
h1 {
    position: relative;
    padding-left: 25px;
  }
  
  h1:before {
    position: absolute;
    content: '';
    bottom: -3px;
    left: 0;
    width: 0;
    height: 0;
    border: none;
    border-left: solid 15px transparent;
    border-bottom: solid 15px rgb(119, 195, 223);
  }
  h1:after {
    position: absolute;
    content: '';
    bottom: -3px;
    left: 10px;
    width: 100%;
    border-bottom: solid 3px rgb(119, 195, 223);
  }
h2 {
    text-align: center;
    font-size: 1.5em;
    margin-bottom: 20px;
    color: #333;
}


.button {
    background-color: #28a745;
    color: white;
    padding: 10px 20px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    width: 300px;
    display: block;
    margin: 0 auto;
}
.button:hover {
    background-color: #218838;
}
form {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f9f9f9;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    text-align: center;
}