Why do I get these hyphens?

Question

I am trying to make 3 buttons using divs, and align them horizontally using percentages. I managed to do that, but I get these hyphens between the divs. The hyphens appear only

Answer 1

Those are not hyphens, but the default underline of your <a>elements.
You can remove them with text-decoration: none; in your css

a {
   text-decoration: none;
   }

.home_buttons {
    width: 10%;
    height: 100px;
    display: inline-block;
    margin-right: 11%;
    margin-left: 11%;
    text-align: center;
    vertical-align: top;
    text-decoration: none;
    text-transform: uppercase;
    font-weight: bold;
    font-size: 90%;
}

<a href="www.google.com">
    <div class="home_buttons" id="book_app_button" >
        <p>book appointment now</p>
    </div>
</a>
<a href="www.facebook.com">
    <div class="home_buttons" id="order_cl_button" >
        <p>order contact lenses</p>
    </div>  
</a>

<a href="www.reddit.com">
    <div class="home_buttons" id="contact_us_button" >
        <p>contact us</p>
    </div>
</a>