ตำแหน่ง: ญาติออกจากพื้นที่ว่าง

#page 
{ 
     overflow:hidden; 
}

section {
  height: 200px;
}

<h2>Extra Whitespace</h2>
<section>
  <div>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
  </div>
  <div style="position:relative;">
    <div style="position:relative; top: -20px; left:100px;">ABSOLUTE</div>
  </div>
  <div>
    Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
  </div>
</section>


<h2>No Whitespace margin-top</h2>
<section>
  <div>
    Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
  </div>
  <div style="position:relative;">
    <div style="position:relative; top: -20px; left:100px;">ABSOLUTE</div>
  </div>
  <div style="margin-top:-20px;">
    Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
  </div>
</section>


<h2>No Whitespace margin-bottom</h2>
<section>
  <div style="margin-bottom:-20px;">
    Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
  </div>
  <div style="position:relative;">
    <div style="position:relative; top: -20px; left:100px;">ABSOLUTE</div>
  </div>
  <div>
    Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.
  </div>
</section>

.moveUp {
    position: relative;
}
.moveUp > * {
    position: absolute;
    width: 100%;
    top: -75px;
}

/** This part is just design - ignore it ... ****/
.box1, .box2, .box3 {
    height: 100px;
    color: white;
}
.box1 {
    background: red;
}
.box2 {
    background: blue;
    height: 50px;
}
.box3 {
    background: green;
}

<div class="box1">Box 1</div>
<div class="moveUp"><div class="box2">Box 2 - 75px up</div></div>
<div class="box3">Box 3</div>