CSS - center two images in css side by side

I am trying to center two images side by side, but for some reason it always displays the images beneath each other. Does anyone know how I could get them centered and next to each other?

Thanks!

HTML code

<a href="mailto:[email protected]">
<img id="fblogo" border="0" alt="Mail" src="http://olympiahaacht.be/wp-content/uploads/2012/07/email-icon-e1343123697991.jpg"/></a>
<a href="https://www.facebook.com/OlympiaHaacht" target="_blank">
<img id="fblogo" border="0" alt="Facebook" src="http://olympiahaacht.be/wp-content/uploads/2012/04/FacebookButtonRevised-e1334605872360.jpg"/></a>`

CSS code

#fblogo {
    display: block;
    margin-left: auto;
    margin-right: auto;
    height: 30px; 
}

Try changing

#fblogo {
    display: block;
    margin-left: auto;
    margin-right: auto;
    height: 30px; 
}

to

.fblogo {
    display: inline-block;
    margin-left: auto;
    margin-right: auto;
    height: 30px; 
}

#images{
    text-align:center;
}

HTML

<div id="images">
    <a href="mailto:[email protected]">
    <img class="fblogo" border="0" alt="Mail" src="http://olympiahaacht.be/wp-content/uploads/2012/07/email-icon-e1343123697991.jpg"/></a>
    <a href="https://www.facebook.com/OlympiaHaacht" target="_blank">
    <img class="fblogo" border="0" alt="Facebook" src="http://olympiahaacht.be/wp-content/uploads/2012/04/FacebookButtonRevised-e1334605872360.jpg"/></a>
</div>​

DEMO.

You can't have two elements with the same ID.

Aside from that, you are defining them as block elemnts, meaning (in layman's terms) that they are being forced to appear on their own line.

Instead, try something like this:

<div class="link"><a href="..."><img src="..."... /></a></div>
<div class="link"><a href="..."><img src="..."... /></a></div>

CSS:

.link {
    width: 50%;
    float: left;
    text-align: center;
}

Flexbox can do this with just two css rules on a surrounding div.

.social-media{
    display: flex;
    justify-content: center;
}

<div class="social-media">
<a href="mailto:[email protected]">
<img class="fblogo" border="0" alt="Mail" src="http://olympiahaacht.be/wp-content/uploads/2012/04/FacebookButtonRevised-e1334605872360.jpg"/></a>
<a href="https://www.facebook.com/OlympiaHaacht" target="_blank">
<img class="fblogo" border="0" alt="Facebook" src="http://olympiahaacht.be/wp-content/uploads/2012/04/FacebookButtonRevised-e1334605872360.jpg"/></a>
</div>

I understand that this question is old, but there is a good solution for it in HTML5. You can wrap it all in a <figure></figure> tag. The code would look something like this:

<div id="wrapper">
<figure>

<a href="mailto:[email protected]">
<img id="fblogo" border="0" alt="Mail" src="http://olympiahaacht.be/wp- 
content/uploads/2012/07/email-icon-e1343123697991.jpg"/>
</a>

<a href="https://www.facebook.com/OlympiaHaacht" target="_blank">
<img id="fblogo" border="0" alt="Facebook" src="http://olympiahaacht.be/wp- 
content/uploads/2012/04/FacebookButtonRevised-e1334605872360.jpg"/>
</a>

</figure>
</div>

and the CSS:

#wrapper{
 text-align:center;
}