<form id="frame"> ?<input type="text" placeholder="賬號" class="text"> ?<input type="password" placeholder="密碼" class="text"> ?<input type="submit" value="登錄" class="button"> </form><style>#frame{ width: 300px; height: 50px; background-color: #fff;? ? background-position: center; margin-top: 100px; opacity: .8;}#frame .text{ width: 145px; height: 8px; background-color: #fff; font-size: 14px; color: #c9c9c9; margin-left: 10px; margin-top: 8px; padding: 10px; opacity: 1; z-index: 3;}</style>