CSS :disabled Pseudo Class - Playground Example

<!DOCTYPE html><html><head><style type="text/css">/* Styling for all inputs and buttons */
input, button {
  padding: 10px;
  margin: 10px 0;
  border-radius: 4px;
  border: 1px solid #ccc;
  display: block;
}

/* Style for the active button */
button {
  background-color: #007bff;
  color: white;
  cursor: pointer;
}

/* THE :DISABLED PSEUDO-CLASS 
   This targets any element with the 'disabled' attribute
*/
input:disabled {
  background-color: #f5f5f5;
  color: #a1a1a1;
  border-color: #ddd;
  cursor: not-allowed; /* Shows a 'circle-slash' icon on hover */
}

button:disabled {
  background-color: #cccccc;
  color: #666666;
  border: 1px solid #999999;
  cursor: not-allowed;
  opacity: 0.7;
}</style></head><body><form class="container">
  <h3>Feedback Form</h3>
  
  <label for="name">Active Input:</label>
  <input type="text" id="name" placeholder="You can type here...">

  <label for="id-number">Disabled Input:</label>
  <input type="text" id="id-number" placeholder="This is locked..." disabled>

  <div class="button-group">
    <button type="submit">Submit Changes</button>
    <button type="button" disabled>Cancel (Locked)</button>
  </div>
</form></body></html>