如何更改所选选项的背景颜色？ （HTML）

Question

When I select one or multiple options in select box in Firefox, the background of the selected options will be blue. But how can I change this background-color with CSS or JS?

Any Ideas?

Answer 1

    <input type="checkbox" value="text" /><span>Item 1</span>
    <input type="checkbox" value="text" /><span>Item 2</span>

<style>
    input:checked + span {
        background: blue;
    }
</style>