CSS Block - Align (Left, Center, Right)

1 - About

How to align a visual element with a block display

This is the block part of the horizontal positioning article

You can align visual element on two level:

3 - Level

3.1 - Box

3.1.1 - Box Center

The box will be centered not the content. As a box takes by default 100% of its space, you need to set a width to see the effect.

The width of the content is 1110 even if the max-width is 1140 because of the padding because the box sizing is set to border-box

<MATH> 1110 = 1140 - 15 -15 </MATH>

To space the box, the following element were used:


  • Pure Css. It's centering the box not the text. As by default a box has a 100% length, you need to set the length to see the effect.

.center-box {
    margin-right:auto; /* or margin: 0 auto; */
    border: 1px solid black;

<h1 class="center-box">Center</h1>

Bootstrap 4

If you are using bootstrap, you can use the utility class mx-auto.

class="mx-auto" style="width: 200px;"

3.1.2 - Box Right

.right-box {
    border: 1px solid black;

<h1 class="right-box">Right</h1>

3.2 - Text

By default a box takes 100% of its space, you can align the text with the text-align property

h1 {
    text-align: center;
    border: 1px solid black;


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