hover: display not showing a div - html

Question

I write this code: jsfiddle.net/4ror198u/1/
That zombi class is ok and when my mouse goes over it it show me that pink box, but why when my mouse is over blue i canno't see the green class ?
Can you help me where im wrong and what i need to do to fix this problem, also to suggest some examples why this thing hapening and how to prevent it in feature.
Thanx in advance! :)

Answer 1

You have misplaced the class green with class shell so I rearranged that and I placed some attributes to the .green class in order the difference to be obvious.The blue box works exactly as the effect that you have for the zombieone.
<meta charset="UTF-8">
<title>Title</title>
<style>
* {
color: yellow;
margin: 0;
padding: 0;
}
.zombitwo {
height: 200px;
width: 200px;
background: pink;
border-radius: 10px;
text-align: center;
line-height: 200px;
display: none;
}
.zombione:hover + .zombitwo {
display: block;
}
.black{
//border: 5px solid red;
background-color: black;
width: 300px;
height: 300px;
}
.blue{
width: 300px;
height: 300px;
background-color: blue;
//border: 5px solid blue;
}
.green{
height: 300px;
width: 300px;
background-color: green;
color:red;
//border: 5px solid green;
display: none;
text-align:center;
}
.blue:hover + .green{
display: block;
}
</style>
<div class="zombione">test</div>
<div class="zombitwo">work</div>
<div class="wrapper">
<div class="shell">
<div class="black">
<div class="blue">
<div class="shell">
</div>
</div>
<div class="green">
<div class="shell">
<div class="sblack"></div>
<div class="sred"></div>
<div class="sgreen">It works fine!!</div>
</div>
</div>
</div>
</div>
</div>