.button {
    background-color: #4CAF50; /* Green */
    border: none;
    color: white;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 20px;
    margin: 4px 2px;
    cursor: pointer;
}
.button_red {
    background-color: #F00; /* Green */
    border: none;
    color: white;
    padding: 10px 20px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 20px;
    margin: 4px 2px;
    cursor: pointer;
}

.button4 {border-radius: 12px;}