Check out example codes for "css vertical align middle". It will help you in understanding the concepts better.

Code Example 1

/* Answer to: "css vertical align middle" */

/*
  Go to: https://www.w3schools.com/css/css_align.asp
  Here you can learn many ways to align horizontal and vertically!
  My favourite method is below:
*/

.center {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
  border: 3px solid green;
}

Code Example 2

.container{	
	margin: 0;
    position: absolute;
    top: 50%;
    left: 50%;
    -ms-transform: translate(-50%, -50%);
    transform: translate(-50%, -50%);
  	width: /* Define the width here; */
    height: /* Define the height here; */
}

/*You have to define the width and height! */

Code Example 3

<!DOCTYPE html>
<!--clearfix-->
<html>
<head>
<style>
div {
  border: 3px solid #4CAF50;
  padding: 5px;
}

.img1 {
  float: right;
}

.clearfix {
  overflow: auto;
}

.img2 {
  float: right;
}
</style>
</head>
<body>

<p>In this example, the image is taller than the element containing it, and it is floated, so it overflows outside of its container:</p>

<div>
  <img class="img1" src="pineapple.jpg" alt="Pineapple" width="170" height="170">
  Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus imperdiet, nulla et dictum interdum...
</div>

<p style="clear:right">Add a clearfix class with overflow: auto; to the containing element, to fix this problem:</p>

<div class="clearfix">
  <img class="img2" src="pineapple.jpg" alt="Pineapple" width="170" height="170">
  Lorem ipsum dolor sit amet, consectetur adipiscing elit. Phasellus imperdiet, nulla et dictum interdum...
</div>

</body>
</html>

Code Example 4

img.a {
  vertical-align: baseline;
}

img.b {
  vertical-align: text-top;
}

img.c {

      
    vertical-align: text-bottom;
}

img.d {
  
    vertical-align: sub;
}

img.e {
  vertical-align: super;
}

Code Example 5

#inner {
  width: 50%;
  margin: 0 auto;
}

Code Example 6

.container{
  display: table;
}

.div-inside-container{
  display: table-cell;
  vertical-align: middle;
}

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