:enabled

label {
  display: block;
  margin-top: 1em;
}
*:enabled {
  background-color: gold;
}

<form>
  <label for="name">Nom :</label>
  <input id="name" name="name" type="text" />
  <label for="emp">Employé :</label>
  <select id="emp" name="emp" disabled>
    <option>Non</option>
    <option>Oui</option>
  </select>
  <label for="empDate">Date d'embauche :</label>
  <input id="empDate" name="empDate" type="date" disabled />
  <label for="resume">CV :</label>
  <input id="resume" name="resume" type="file" />
</form>

:enabled {
  /* ... */
}

<form action="url_of_form">
  <label for="PremierChamp">Premier champ (activé) :</label>
  <input type="text" id="PremierChamp" value="Titi" /><br />
  <label for="DeuxiemeChamp">Deuxième champ (désactivé) :</label>
  <input
    type="text"
    id="DeuxiemeChamp"
    value="Toto"
    disabled="disabled" /><br />
  <input type="button" value="Envoyer" />
</form>

input:enabled {
  color: #22bb22;
}
input:disabled {
  color: #aaaaaa;
}