:enabled

label {
  display: block;
  margin-top: 1em;
}

*:enabled {
  background-color: gold;
}

<form>
  <label for="name">Name:</label>
  <input id="name" name="name" type="text" />

  <label for="emp">Employed:</label>
  <select id="emp" name="emp" disabled>
    <option>No</option>
    <option>Yes</option>
  </select>

  <label for="empDate">Employment Date:</label>
  <input id="empDate" name="empDate" type="date" disabled />

  <label for="resume">Resume:</label>
  <input id="resume" name="resume" type="file" />
</form>

<form action="url_of_form">
  <label for="FirstField">第一个字段（已启用）:</label>
  <input type="text" id="FirstField" value="Lorem" /><br />

  <label for="SecondField">第一个字段（已禁用）:</label>
  <input type="text" id="SecondField" value="Ipsum" disabled="disabled" /><br />

  <input type="button" value="Submit" />
</form>

input:enabled {
  color: #2b2;
}

input:disabled {
  color: #aaa;
}