Center multiple divs inside another div - css

Question

I'm trying to center 4 divs inside a bigger div with equal margin between them, and it doesn't seem to work.
I've looked at other answers and tried margin: 0 auto but it didn't work for me.
here's the HTML:
<div id="footer_frame">
mail#gmail.com
<span id="phone">044-1234567</span>
<div id="footer_icons">
<div class="icon_div">
<img src="images/youtube.png" alt="Watch our work at our YouTube page" class="icon" />
<p>YouTube</p>
</div>
<div class="icon_div">
<img src="images/email.png" alt="Contact us" class="icon" />
<p>Email</p>
</div>
<div class="icon_div">
<img src="images/googleplus.png" alt="Join our circle # Google+" class="icon" />
<p>Google+</p>
</div>
<div class="icon_div">
<img src="images/facebook.png" alt="Join our Facebook page" class="icon" />
<p>Facebook</p>
</div>
</div>
And the CSS:
#footer_frame {
position: absolute;
background-color: rgba(0,0,0,0.8);
width: 25%;
height: 16%;
top: 83%;
left: 37.5%;
}
#footer_icons {
width: 90%;
clear:both;
margin-top:12%;
}
#footer_icons .icon_div {
display: inline-block;
text-align: center;
font-size: 0.9em;
color: white;
}
#footer_icons .icon_div p {
margin: 0.2em;
}
Now it looks like this, but what I want is that the 4 icons will be centered inside the black div.
Thanks.

Answer 1

Wrap all four inner divs with a single DIV and then set a fixed width and use margin: 0 auto on that one.

Answer 2

When I do things like this I try to use flexboxes as often as possible. The above answer works perfectly but I just thought you might want to try these two options out.
#footerIcons{ display: inline-flex;} .iconDiv{ display: -webkit-flexbox;
-webkit-flex-pack: center;
-webkit-flex-align: center;
}
This should work. For more info visit this link. Before you try to use flexbox in your code make sure you have a ll the right vendor prefixes.