Responsive div's floating and centered

Question

Now I have put float:left on my green divs but that makes them stick to the left (makes sense). Now how can I keep my divs centered while I resize the blue container?

As in this image:

Blue: Parent container Green: Divs

Answer 1

You can use display: inline-block on your child items and text-align: center on parent item

<div class="container">
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
</div>

.container {
    background-color: blue;
    width:500px;
    text-align: center;
}

.item {
    display: inline-block;
    background-color: green;
    width: 100px;
    height: 100px;
}

https://jsfiddle.net/g3vp2fyf/