Ubuntu App: Clicking a div

I wasn't able to figure out the problem with my meanings app and I got kind of frustrated so I abandoned it for now and I tried to make my own small app. I decided to make a div that when pressed would add a class. I had one error about my maintainer name because I was unaware you had to put a certain name for that field but I fixed that not too long afterwards. I also had 2 warnings that I don't really know how to fix and I couldn't find a solution on the internet.

In my body I simply had a div that also started with a class
<div id="test" class="blink">TEST</div>

I just used two classes that were already provided, the div started with "blink" which I'm assuming would make the div fade in and out
.blink {
    animation:fade 3000ms infinite;
    -webkit-animation:fade 3000ms infinite;
}
and when clicked would have the class "is-hidden" which I'm also assuming just makes the div disappear
 .is-hidden {
    display: none;
}

My javascript was just a click function that would add the class "is-hidden"
$(document).ready(function() {
    $("#test").click(function() {
        $(this).addClass("is-hidden")
    });
});