The default grid system provided as part of Bootstrap is a 940px-wide, 12-column grid.
（3回目・4回目と続き計4回） ◆◆◆■奥州出身の野球少年 東京から北へ約400キロ様々なフェイズに登場しながら攻撃を加速させたタケ不在の影響は明らかだった
<div class="row"> <div class="span4">...</div> <div class="span8">...</div> </div>
As shown here, a basic layout can be created with two "columns," each spanning a number of the 12 foundational columns we defined as part of our grid system.
<div class="row"> <div class="span4">...</div> <div class="span4 offset4">...</div> </div>
With the static (non-fluid) grid system in Bootstrap, nesting is easy. To nest your content, just add a new .row and set of .span* columns within an existing .span* column.