以HTML格式输入样式

我有一个输入类型的密码,只允许这样的六位数：

<fieldset>
  <label for="password-input">Enter New Pin</label>
  <input type="password" name="password" id="password-input" inputmode="numeric" minlength="6"
  maxlength="6" size="6" value="">
  <span class="hint">New pin must be 6 digit number only</span>
</fieldset>

它将显示如下：

我该如何设计它,使它看起来如下？

解决方法

解决问题：

>在场集上放置:: after而不是输入框或添加元素.
>使用下划线设置内容值,并定位元素.
>在输入框中添加字母间距和宽度,并设置：focus为outline：none以删除蓝色框.

fieldset {
  color: #555;
  font-family: sans-serif;
  border: none;
  position: relative;
}

fieldset > * {
  display: block;
}

fieldset::after {
  content: "___  ___  ___  ___  ___  ___";
  display: block;
  position: absolute;
  top: 35px;
  white-space: pre;
}

label {
  font-size: 14px;
  margin-bottom: 6px;
}

input#password-input {
  position: relative;
  font-size: 16px;
  z-index: 2;
  border: none;
  background: transparent;
  width: 300px;
  text-indent: 9px;
  letter-spacing: 25.6px;
  font-family: Courier;
}

input#password-input:focus {
  outline: none;
}

span.hint {
  margin-top: 8px;
  font-size: 12px;
  font-style: italic;
}

span.hint::before {
  content: "* ";
}

<fieldset>
  <label for="password-input">Enter New Pin</label>
  <input type="password" name="password" id="password-input" inputmode="numeric" minlength="6" maxlength="6" size="6" value="">
  <span class="hint">New pin must be 6 digit number only</span>
</fieldset>