/* Tystyle.css */  
button {  
    width: 355px;  
    height: 40px;  
    background-color: #4CAF50;  
    color: white;  
    border: none;  
    border-radius: 5px;  
    cursor: pointer;  
    font-size: 14px;  
    transition: background-color 0.3s ease; /* 添加过渡效果 */  
}  
  
button:active {  
    background-color: #307d33; /* 点击时背景色变暗 */  
}