Check out example codes for "html center tag". It will help you in understanding the concepts better.

Code Example 1

To text align all yuo have to do this:
  .yournameforclass {
    background: #fff; //which does not have to be there
    text-align: center;
    width: 100%;  //all of this can be varied. Text align can be used in these forms: left, which is to the left, right, to the right of the screen
    height: 300px;

Code Example 2

	<p>This is centered</p>

Code Example 3

<!-- use the center tag -->
  <!-- your code -->

Code Example 4

			margin:1% auto;
			margin-right: auto; margin-left: auto; width: 21%; 
			padding-top: 11px;

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