Utilize the flexible grid system () and ensure your container divs have a width of 100%, as shown below:
CSS:
<style type="text/css>
/* after including your bootstrap css */
.container, .navbar-static-top .container, .navbar-fixed-top .container, .navbar-fixed-bottom .container
{
width: 100%;
}
</style>
HTML:
<div class="container">
<div class="row-fluid">
<div class="span4" style="background-color:red;">...</div>
<div class="span8" style="background-color:yellow;">...</div>
</div>
</div>
update:
Divide into rows with 50% height:
CSS:
<style type="text/css>
/* after including your bootstrap css */
body, html, .container,.row-fluid .hunderd{ height:100%; min-height:100%; !important;}
.container, .navbar-static-top .container, .navbar-fixed-top .container, .navbar-fixed-bottom .container
{
width: 100%;
}
.fifty {height:50%;min-height:50%;}
</style>
HTML:
<div class="container">
<div class="row-fluid fifty">
<div class="span6 hunderd" style="background-color:red;">...</div>
<div class="span6 hunderd" style="background-color:yellow;">...</div>
</div>
<div class="row-fluid fifty">
<div class="span6 hunderd" style="background-color:blue;">...</div>
<div class="span6 hunderd" style="background-color:orange;">...</div>
</div>
</div>