Layout has wide rows when browser width is smaller - css

Question

here's my markup:
<style>
a.item
{
border:1px solid #aaa;
background:#ddd;
padding:10px;
display:block;
}
span.price
{
display:block;
text-align:center;
background:#555;
color:white;
}
</style>
<div class="main">
<div class="row">
<div class="col-md-3">
<a class="item" href="#">
<div class="row">
<div class="col-md-6">
IMAGE
</div>
<div class="col-md-6">
<span class='price'>123.45</span>
</div>
</div>
</a>
</div>
<div class="col-md-3">
<a class="item" href="#">
<div class="row">
<div class="col-md-6">
IMAGE
</div>
<div class="col-md-6">
<span class='price'>123.45</span>
</div>
</div>
</a>
</div>
<div class="col-md-3">
<a class="item" href="#">
<div class="row">
<div class="col-md-6">
IMAGE
</div>
<div class="col-md-6">
<span class='price'>123.45</span>
</div>
</div>
</a>
</div>
<div class="col-md-3">
<a class="item" href="#">
<div class="row">
<div class="col-md-6">
IMAGE
</div>
<div class="col-md-6">
<span class='price'>123.45</span>
</div>
</div>
</a>
</div>
</div>
</div>
it looks fine - like this:
the problem however is - when decreasing the browser window's width, it will destroy the layout and will look like this:
"image" and price are not side-bye-side anymore .. any ideas what's wrong with my code?
thanks

Answer 1

Include col-xs-6 next to col-md-6.
https://jsfiddle.net/gqmarfkh/ jsFiddle - I changed 2 of them as an example.

Answer 2

If you change .col-md-6 to col-xs-6 it should solve your problem. The class col-md-6 has no value untill the screen size is medium and up. Class col-xs-* will have a value from x-small and up. Check out this link: http://getbootstrap.com/css/#grid-options