After transition is complete, show the div - html

Question

Dear Stackoverflow readers,
Using only CSS3, how do I show a div after a transition is completed.
This is the snippet of HTML I'm working with
<div class="biography">
<p>Title</p>
<p id="moreBio">This is a test. This is a test. This is a test. This is a test. This is a test. This is a test. This is a test. This is a test. This is a test.</p>
</div>
This is the snippet of CSS3 I'm working with
.biography {
width: 100px;
height: 40px;
float: left;
margin: 5px;
background: #3399FF;
color: #ffffff;
box-shadow: 2px 2px 10px rgba(0, 0, 0, 0.5);
position: relative;
right: 5%;
font-weight: bold;
font-size: 15px;
text-align: center;
padding: 10px;
border-radius: 5px;
opacity: 0.4;
transition: all 0.5s ease;
-webkit-transition: all 0.5s ease;
-o-transition: all 0.5s ease;
-moz-transition: all 0.5s ease;
}
.biography:hover {
width: 200px;
height: 600px;
margin: 10px 10px 0px -100px;
opacity: 1;
background: #7C7C7C;
}
#moreBio {
opacity: 0;
transition: opacity 0.5s ease;
-webkit-transition: opacity 0.5s ease;
-o-transition: opacity 0.5s ease;
-moz-transition: opacity 0.5s ease;
}
#moreBio:hover {
opacity: 1;
}
I want #moreBio to show after the transition is completed, how would I go about doing that?
Thank you so much in advance.

Answer 1

Add a transition-delay to #moreBio equal to the transition time of .biography, and make the appearance trigger when .biography is hovered upon.
#moreBio {
opacity: 0;
transition: opacity 0.5s 0.5s ease;
-webkit-transition: opacity 0.5s 0.5s ease;
-o-transition: opacity 0.5s 0.5s ease;
-moz-transition: opacity 0.5s 0.5s ease;
}
.biography:hover #moreBio {
opacity: 1;
}

Answer 2

Instead of doing #moreBio:hover you could do .biography:hover #moreBio and then add a delay for the #moreBio transition like so
// ... other code just like it's
#moreBio {
opacity: 0;
transition: opacity 0.5s ease;
-webkit-transition: opacity 0.5s ease;
-o-transition: opacity 0.5s ease;
-moz-transition: opacity 0.5s ease;
-webkit-transition-delay: 0.5s;
transition-delay: 0.5s;
}
.biography:hover #moreBio {
opacity: 1;
}
Here is the working sample.