CSS card overlay with image and text

Question

I am trying to create an overlay that will cover an entire div/card. I have three cards that I want to rollover black when active. For some reason, I can't get the entire div to be selected.

HTML:

  <div class="item "> 
  <div class="overlay">
  <img src="http://placehold.it/600x350">
  <h2>Title</h2>
  <p> Text</p>
  </div><div class="overlay"> </div> 
  </div>

and CSS:

 .item {

    padding: 0px 0;
  margin: 1%;
    border-radius: 2px;
  flex: 1 250px;
  height: auto;
  text-align: center;
  background: linear-gradient(0deg, #efefef, #ffffff);
}

.overlay {
  position: relative;
   background-color: rgba(0,0,0,0)
   -webkit-transition: opacity 1s ease-in-out;
   -moz-transition: opacity 1s ease-in-out;
   -o-transition: opacity 1s ease-in-out;
   transition: opacity 1s ease-in-out;
}


.overlay:hover {
  opacity: 1;
  background-color: rgba(0,0,0,1);

}

CODEPEN EXAMPLE

Answer 1

div.item has a certain size and shape. Style it as relative so that the next thing will work

Make div.overlay position:absolute - that will overlay it, but it has no size, so it will still be invisible.

Then, make div.overlay the full height of its parent ( div.item ).

When made visible (at :hover) it will be 100% height/width of .item, and will overlay it.

 body {background-color: #C70025;} img {width: 100%;} #container {width:90%;margin:0 auto;display:flex;flex-wrap:wrap; justify-content:space-between;} .item {color:#000;padding:0px 0;margin:1%;border-radius:2px;flex:1 250px;height:auto;text-align:center;background:linear-gradient(0deg, #efefef, #ffffff);} .item{position:relative;} .overlay { position:absolute; top:0;left:0;right:0;bottom:0; background-color: rgba(0,0,0,0) -webkit-transition: opacity 1s ease-in-out; -moz-transition: opacity 1s ease-in-out; -o-transition: opacity 1s ease-in-out; transition: opacity 1s ease-in-out; } .overlay:hover { opacity: 1; background-color: rgba(0,0,0,1); } 

 <div id="container"> <div class="item "> <img src="http://placehold.it/600x350"> <h2>Title</h2> <p> Text</p> <div class="overlay"> </div> </div> <div class="item"> <img src="http://placehold.it/600x350"> <h2> Title </h2> <p>Text</p> <div class="overlay"> </div> </div> <div class="item"> <img src="http://placehold.it/600x350"> <h2> Title </h2> <p>Text</p> <div class="overlay"> </div> </div> </div>