表单相关伪类选择器

	  input:disabled {
            background-color: #2aabd2;
      }
	  <form action="#">
          <input type="text" disabled>
      </form>

效果为

	input:disabled {
            background-color: #2aabd2;
        }

        input:checked+label {
            color: red;
        }
	<form action="#">
          <input type="text" disabled>
          <input type="radio" name="sex" id="boy">
          <label for="boy">男</label>
          <input type="radio" name="sex" checked id="girl">
          <label for="boy">女</label>
      </form>

效果为