Styling Divs - Drop Shadow through the middle of other div - html

Question

I'm trying to create CSS styles that LOOK like a flip counter but don't actually function as one. I've got the general look and feel figured out, but I can't seem to get my box-shadow to overlap the display number.
This is what I have so far:
.numberwrapper {
width: 50px;
height: 90px;
background-color: black;
border-radius: 5px;
position: relative;
display: inline-block;
}
.shadow {
width: 100%;
height: 50%;
z-index: 100;
box-shadow: 0px 5px 4px -2px #888888;
}
.number {
font-family: 'Tahoma', sans-serif;
top: -90;
color: #ffffff;
font-size: 85px;
line-height: 0px;
text-align: center;
}
.bigcomma {
font-family: 'Tahoma', sans-serif;
font-size: 85px;
color: black;
}
<div class="numberwrapper">
<div class="shadow">
</div>
<div class="number">
1
</div>
</div>
<span class="bigcomma">,</span>
<div class="numberwrapper">
<div class="shadow">
</div>
<div class="number">
2
</div>
</div>
<div class="numberwrapper">
<div class="shadow">
</div>
<div class="number">
3
</div>
</div>
<div class="numberwrapper">
<div class="shadow">
</div>
<div class="number">
4
</div>
</div>
Like I said, my biggest issue is that I can't get my .shadow div to show up on top of the number.

Answer 1

Add "position: relative" to .shadow for the z-index to kick in:
.numberwrapper {
width: 50px;
height: 90px;
background-color: black;
border-radius: 5px;
position: relative;
display: inline-block;
}
.shadow {
width: 100%;
height: 50%;
z-index: 100;
box-shadow: 0px 5px 4px -2px #888888;
position: relative;
}
.number {
font-family: 'Tahoma', sans-serif;
top: -90;
color: #ffffff;
font-size: 85px;
line-height: 0px;
text-align: center;
}
.bigcomma {
font-family: 'Tahoma', sans-serif;
font-size: 85px;
color: black;
}
<div class="numberwrapper">
<div class="shadow">
</div>
<div class="number">
1
</div>
</div>
<span class="bigcomma">,</span>
<div class="numberwrapper">
<div class="shadow">
</div>
<div class="number">
2
</div>
</div>
<div class="numberwrapper">
<div class="shadow">
</div>
<div class="number">
3
</div>
</div>
<div class="numberwrapper">
<div class="shadow">
</div>
<div class="number">
4
</div>
</div>