Hide url on mouseover php short-url?

Question

I have a script that acts as a short url I would like to hide when I hover over the url, I am attaching the code:

<div class="container splash">
        <div class="row">
            <div class="col-md-12">
                    <div class="row">
                        <div class="col-sm-2">
                        </div>
                        <div class="col-sm-8">

                            <a href="<?php echo $url->url ?>" class="btn btn-lg btn-secondary btn-block redirect" rel="nofollow"><?php echo e("GO GO GO CONTINUE"); ?></a>

                        </div>
                        <div class="col-sm-2">
                        </div>
                    </div>
            </div>
        </div>
</div>

I also attach a screen: https://i.stack.imgur.com/7yzMZ.png I'm not that good at programming so I ask for a hand kindly