h1 {
    color: black;
    font-family: "HYZhengyuan", serif;
    font-size: 50px;
    text-align: center;
    margin-top: 50px;
    margin-bottom: 50px;
}
#123 {
    color: black;
    font-family: "HYZhengyuan", serif;
    font-size: 50px;
    text-align: center;
    margin-top: 50px;
    margin-bottom: 50px;
}
button {
background-color: #4CAF50;
    border: none;
    color: white;
    padding: 15px 32px;
    margin-left: 50px;
    margin-right: 50px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 16px;
}