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>