input标签透明度改不回来

Question

<form id="frame">  <input type="text" placeholder="账号" class="text">  <input type="password" placeholder="密码" class="text">  <input type="submit" value="登录" 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>