Why doesn't the whole cell go well?

[yajahira]

I don't know why, but well, it's a mansion from the whole cell. What did I do wrong?

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
<div class="container">
  <div class="row-fluid">
    <div class="col-md-8">
      <div class="well">
        <div class="row-fluid">
          <div class="col-md-6">
            <div>
              text
            </div>
            <div>
              text
            </div>
            <div>
              text
            </div>
          </div>
          <div class="col-md-6">
            <div>
              text
            </div>
            <div>
              text
            </div>
            <div>
              text
            </div>
          </div>
        </div>
        <div class="row-fluid">
          <div class="col-md-8 col-md-offset-2">
            <button type="button" class="btn btn-lg btn-success btn-block" id="success">Продолжить</button>
          </div>
        </div>
      </div>
    </div>
  </div>
</div>

If you remove the lower button and surrounding it <div class="col-md-8 col-md-offset-2">it works properly. Bootstrap 3.3.6.

[gionna]

On a wide screen, the Bhutanese columns receive properties float: left; and the parent block is closing. There are two spreaders. https://webref.ru/layout/advanced-html-css/detailed-css-positioning :

Clearfix

Boothstrup wants class. .row such properties:

.row:before,
.row:after {
  display: table;
  content: " ";
}
.row:after {
  clear: both;
}

Call attention to class. .row-fluid Total https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.css No.

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
<div class="container">

<div class="row">

<div class="col-md-8">

<div class="well">

<div class="row">

<div class="col-md-6">

<div>

text

</div>

<div>

text

</div>

<div>

text

</div>

</div>

<div class="col-md-6">

<div>

text

</div>

<div>

text

</div>

<div>

text

</div>

</div>

</div>

<div class="row">

<div class="col-md-8 col-md-offset-2">

<button type="button" class="btn btn-lg btn-success btn-block" id="success">Продолжить</button>

</div>

</div>

</div>

</div>

</div>

</div>

Overflow

If you add a parent block the properties overflow: hidden;, he'll calculate his height with the account of floating descendants:

.well {

overflow: hidden;

}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">

<div class="container">

<div class="row-fluid">

<div class="col-md-8">

<div class="well">

<div class="row-fluid">

<div class="col-md-6">

<div>

text

</div>

<div>

text

</div>

<div>

text

</div>

</div>

<div class="col-md-6">

<div>

text

</div>

<div>

text

</div>

<div>

text

</div>

</div>

</div>

<div class="row-fluid">

<div class="col-md-8 col-md-offset-2">

<button type="button" class="btn btn-lg btn-success btn-block" id="success">Продолжить</button>

</div>

</div>

</div>

</div>

</div>

</div>