Using transition to absolute position on hover - html

Question

I'm trying to get a transitional animation on a DIV on hover. However, it's not working. I feel like I'm missing something!
JSFIDDLE DEMO
HTML
<div class="profile__container">
<img src="http://i.imgur.com/SGw04SV.jpg" class="profile__list--resume img-fluid" />
<div class="profile__button">
<h2>Hello World</h2>
</div>
</div>
CSS:
.profile__button {
display: none;
background: linear-gradient(to bottom, transparent 0%, #08ca77 60%);
padding: 120px 15px 15px;
text-transform: capitalize;
-moz-transition: all 0.5s ease-in-out;
transition: all 0.5s ease-in-out;
}
.profile__container:hover .profile__button {
display: block;
position: absolute;
left: 0;
right: 0;
bottom: 0;
width: 100%;
text-align: center;
}

Answer 1

Instead of using display property use opacity and visibility as shown below.
.profile__button {
background: linear-gradient(to bottom, transparent 0%, #08ca77 60%);
padding: 120px 15px 15px;
text-transform: capitalize;
transition: .5s;
opacity: 0;
visibility: hidden;
position: absolute;
left: 0;
right: 0;
bottom: 0;
width: 100%;
text-align: center;
}
.profile__container:hover .profile__button {
opacity: 1;
visibility: visible;
}
<div class="profile__container">
<img src="http://i.imgur.com/SGw04SV.jpg" class="profile__list--resume img-fluid" />
<div class="profile__button">
<h2>Hello World</h2>
</div>
</div>

Answer 2

.profile__container {
display: block;
height: 100%;
width: 100%;
}
div.profile__button, div.profile__button:hover {
display: inline-block;
padding: 70px 15px 15px;
text-transform: capitalize;
-moz-transition: .5s ease-in-out;
transition: .5s ease-in-out;
}
div.profile__button {
background: linear-gradient(to bottom, transparent 0%, #08ca77 30%);
opacity: 1;
}
div.profile__button:hover {
background: linear-gradient(to bottom, transparent 0%, #08ca77 90%);
opacity: 0.5;
}