When I scroll down I want to hide the big logo and expose the small logo
<div class="row clearfix" >
<div class="col-md-12 column">
<nav class="navbar navbar-default" role="navigation" data-spy="affix" data-offset-top="10">
<div class="navbar-header"> <a class="big_logo" href="#"><img src="img/logo.png" alt="logo"></a><a class="small_logo" href="#"><img src="img/logo_small.png" alt="logo_small"></a></div>
</nav>
</div>
</div>
I dont know what I am messing up here in my CSS:
.big_logo {
}
.big_logo.affix {
display:none;
}
.small_logo {
display:none;
}
.small_logo.affix {
}