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HTML

              
                <h2>1. Modern Flexbox (Recommended method)</h2>
<div class="flexbox padre">
  <div class="hijo">Content here.</div>
</div>

<h2>2. Line-height method</h2>
<div class="line-height padre">
  <div class="hijo">Content here. Only works with one line of text.</div>
</div>

<h2>3. CSS Table method</h2>
<div class="table padre">
  <div class="hijo">Content here.</div>
</div>

<h2>4. Absolute position and negative margin method</h2>
<div class="absolute padre">
  <div class="hijo">Content here.</div>
</div>

<h2>Absolute position and Stretch method</h2>
<div class="stretch padre">
  <div class="hijo">Content here.</div>
</div>

<h2>Padding top and bottom method</h2>
<div class="padding padre">
  <div class="hijo">Content here.</div>
</div>

<h2>Floating div method</h2>
<div class="floating padre">
  <div class="floater"></div>
  <div class="hijo">Content here.</div>
</div>
              
            
!

CSS

              
                /* General styles, nothing relevant for vertical alignment */
.padre {
  background-color: #ccc;
  max-width: 400px;
  height: 200px;
}

/* Relevant example codes */

/* Example 1: Flexbox method */
.flexbox.padre {
  display: flex;
  align-items: center;
}

/* Example 2: line-height method */
.line-height .hijo {
  line-height: 200px;
}

/* Example 3: CSS table method */
.table.padre {
  display: table;
  height:200px;
  width: 100%;
}
.table .hijo {
  display: table-cell;
  vertical-align: middle;
}

/* Example 4: Absolute position and negative margin method */
.absolute.padre {
  position: relative;
}
.absolute .hijo {
  position: absolute;
  top: 50%;
}

/* Example 5: Absolute position and stretch method */
.stretch.padre {
  position: relative;
}
.stretch .hijo {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  right: 0;
  width: 100%;
  height: 30%;
  margin: auto;
  
  background-color: #b2b2b2; /* Just for you can see it */
}

/* Example 6: Padding method */
.padding.padre {
  padding: 5% 0;
  height: auto; /* If you set a fixed height, this won't work */
}
.padding .hijo {
  padding: 10% 0;
}

/* Example 5: Floating div method */
.floating.padre {
  height: 250px;
}
.floating .floater {
  float: left;
  height: 50%;
  width: 100%;
  margin-bottom: -50px;
}
.floating .hijo {
  clear: both;
  height: 100px;
}
              
            
!

JS

              
                
              
            
!
999px

Console