<div class="page">
  <div class="page-left-column">
    <div class="page-left-column-container-box">
      <div class="page-left-column-container-box-element-header-wrapper">
         <h2>This is the header!</h2>
      </div>
    </div>
  </div>
</div>

.page-left-column-container-box-element-header-wrapper {
  color: red;
}

<div class="page">
  <div class="left column">
    <div class="container-box">
      <div class="element header-wrapper">
         <h2>This is the header!</h2>
      </div>
    </div>
  </div>
</div>

.page .left.column .container-box .element.header-wrapper {
  color: red;
}

.page .left.column .container-box .element.header-wrapper

.page-left-column-container-box-element-header-wrapper

header-wrapper

.pg-fl-r

.float-right, .page-float-r