Text vertically & horizontally aligned on image on responsive Wordpress page - html

Question

Here's the page upon which I'm working.
I'm using Shortcodes Ultimate to get the columns, and it's responsive. Now I'm trying to get a text hover with background over the images, preferably without JS for now. I can get it to hover perfectly if it's given defined height and width, but then that's not responsive.
On CodePen, it shows the title going all the way across the page, but the Shortcodes Ultimate columns eliminate that. But it probably isn't best design, either.
I've followed about 20 different tutorials to get where I am, but am stuck now.
CodePen
HTML:
<div id="portfolio_hover_wrapper">
<a href="#" class="wistia-popover">
<img src="https://embed-ssl.wistia.com/deliveries/b9d3c0914d895ac2fb274c0c8798ad66f6e5d4f0.jpg?image_crop_resized=640x360" alt="" class="hover" />
<span class="portfolio-hover-text"><span>ADO Rowing</span>
</a>
</div>
CSS:
#portfolio_hover_wrapper {
list-style-type: none;
margin: 0;
padding: 0;
text-align: center;
}
#portfolio_hover_wrapper a {
display: inline-block;
width: 100%;
height: 100%;
position: relative;
}
span.portfolio-hover-text {
background: rgba(27,187,230,0.8);
color: white;
display: table;
font-size: 3em;
position: absolute;
width: 100%;
height: 100%;
top: 0;
opacity: 0;
-webkit-transition: opacity 500ms;
-moz-transition: opacity 500ms;
-o-transition: opacity 500ms;
transition: opacity 500ms;
}
#portfolio_hover_wrapper a:hover span.portfolio-hover-text {
opacity: 1;
}
span.portfolio-hover-text span {
display: table-cell;
text-align: center;
vertical-align: middle;
}

Answer 1

If I understand what you want try using top: 50%; transform: translateY(-50%); in .portfolio-hover-text.
My bad I misunderstood your question, try adding the following:
span.portfolio-hover-text {
background: rgba(27,187,230,0.8);
color: white;
display: block;
font-size: 3em;
position: absolute;
top: 0;
width: 100%;
height: 100%;
opacity: 0;
-webkit-transition: opacity 500ms;
-moz-transition: opacity 500ms;
-o-transition: opacity 500ms;
transition: opacity 500ms;
}
span.portfolio-hover-text span{
position: absolute;
top: 50%;
transform: translate(-50%,-50%);
white-space: nowrap;
}

Answer 2

In order to overlay text over an image I like to set the parent DIV to have the image as a background and child the text to it like such
<div class="box image1">
<div class="overlay fade">
<span class="text">ADO Rowing</span>
</div>
</div>
CSS
.box {
width: 75%; /*To make it responsive*/
height: 40em;/*Height should be fixed*/
box-shadow: inset 0px 2px 7px 0 rgba(0, 0, 0, .6);/*just for looks*/
margin: 5% auto 0 auto; /*Centers the div*/
border-radius: 5px; /*just for looks*/
overflow: hidden; /*Needed if our text overflows*/
}
.image1 {
background: url(https://embed-ssl.wistia.com/deliveries/b9d3c0914d895ac2fb274c0c8798ad66f6e5d4f0.jpg?image_crop_resized=640x360);/*Image*/
background-size: cover;/*Makes the background look responsive*/
background-position:center;/*for looks*/
}
Now we need to style the overlay. More CSS
.overlay {
background: rgba(33, 150, 243, .6);/*Overlay color*/
text-align: center;
padding: 1em 0 1em 0;/*adjust this if you want it cover the entire img*/
height:25%;/*Change this to 100% for whole image*/
opacity: 0;
margin: 25% 0 0 0;/*Moves the banner down*/
box-shadow: 0 2px 7px rgba(33, 150, 243, .4);
}
.text {
font-family: Helvetica;
font-weight: 900;
color: rgba(255, 255, 255, .85);
font-size: 96px;
}
Padding will increase the div size and thus increase the color size, while margin will just space the div out without changing the size of the background, so I use margin to position and padding for sizing.
lastly we need to make some snappy animation on :hover
.fade {
-webkit-transition: opacity .25s ease;
-moz-transition: opacity .25s ease;
-ms-transition: opacity .25s ease;
transition: opacity .25s ease;
}
.box:hover .fade {
opacity:1;
}
That will change the opacity from 0 to 1 on hover with a .25s tranisition. That should be about it, hope that helps. View the CodePen Here