How can I center a button using CSS if it is not movable?

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If a button cannot be moved with CSS, you can try the following steps to center it:

1. Set the button's display property to "block" or "inline-block".
2. Set the left and right margins of the button to "auto".
3. Set the width of the button if necessary.

For example, if your button has the class "my-button", you would use the following CSS:

.my-button {
  display: block;
  margin: 0 auto;
  /* optional, set the width of the button */
  width: 150px;
}

This will center the button horizontally within its parent element. If you also want to center it vertically, you can use flexbox or other techniques.