JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://twitter.github.com/bootstrap/assets/css/bootstrap.css">
<div class="scroll-sucker">
<div class="span9 ">
<div class="row show-grid">
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
</div>
</div>
</div>
<div class="span9 scroll-sucker2">
<div class="row show-grid">
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
</div>
</div>
<div class="row show-grid">
    <div title="" data-original-title="" class="span4">4</div>
    <div title="" data-original-title="" class="span5">5</div>
</div>
<div class="row show-grid">
    <div title="" data-original-title="" class="span9">9</div>
</div>
</div>
<div class="span9">
<p>Same content without scrollbar is fine: </p>
</div>
<div class="span9">
<div class="row show-grid">
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title="" data-original-title="" class="span1">1</div>
    <div title=""...

CSS

.scroll-sucker {
 overflow: scroll;   
}

.scroll-sucker2 {
 overflow: scroll; 
    width: 717px;
}

div.span1 {
    background: grey;
}

p {
    padding: 1em;
}