如何在CSS中更改输入文字

我正在用html制作简单表格。背景是黑色的,所以我希望输入的文本为白色。到目前为止,这就是我所拥有的。

<form method="GET">
   <input type="text" name="name" placeholder="Full Name"><br/>
<input type="submit">
</form>

picture of html website I highlight the typing text in the picture "asdasd" I want the user can type their text in color white. I've tried color: #ffffff; in css, but it does not works. Any help would appreciated.