a.css-3d-btn{ position: relative; color: rgba(255, 255, 255, 1); text-decoration: none; background-color: rgba(219, 87, 51, 1); font-family: "Microsoft YaHei", 微軟雅黑, 宋體; font-weight: 700; font-size: 3em; display: block; padding: 4px; border-radius: 8px; /* let's use box shadows to make the button look more 3-dimensional */ box-shadow: 0px 9px 0px rgba(219, 31, 5, 1), 0px 9px 25px rgba(0, 0, 0, .7); margin: 100px auto; width: 160px; text-align: center; -webkit-transition: all .1s ease; -moz-transition: all .1s ease; transition: all .1s ease;}/* now if we make the box shadows smaller when the button is clicked, it'll look like the button has been "pushed" */a.css-3d-btn:active{ box-shadow: 0px 3px 0px rgba(219, 31, 5, 1), 0px 3px 6px rgba(0, 0, 0, .9); position: relative; top: 6px;}