jquery if any checkbox is checked

There are many questions regarding checked checkbox , but this is somewhat different.
I want to display a css property if any checkbox is checked by the user. And if the user un-checks all the checkbox that css property should be removed.
I found this code

if (jQuery('#frmTest input[type=checkbox]:checked').length > 0) {
    $(".css-check").css("background-color", "yellow");
} else {
    $(".css-check").css("background-color", "pink");
}

<script src="http://ift.tt/1oMJErh"></script>
<form id="frmTest">
    <input type="checkbox" name="vehicle" value="Car" class="test">I have a car
    <br>
    <input type="checkbox" name="vehicle" value="Car" class="test">I have a bike
    <br>
    <input type="checkbox" name="vehicle" value="Car" class="test">I have nothing
    <br>
</form>
<div class="css-check">TEST</div>

But this only works when i place checkbox="true".
In Short:
if no checkbox is checked by user , background-color should be pink. And if even one checkbox is checked background-color should be yellow.