CSS 按钮

.w3-ripple{ position: relative; background-color: #4CAF50; border: none; font-size: 28px; color: #FFFFFF; padding: 20px; width: 200px; text-align: center; -webkit-transition-duration: 0.4s; /* Safari */ transition-duration: 0.4s; text-decoration: none; overflow: hidden; cursor: pointer; } .w3-btn {