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Button Centering Issue

Hi, So I got a school project for making a Dichotomous Key, and I decided to make my project into a website instead of printing it out on paper. I have 4 pages, a picture page with all the pictures for the key on, a page for the actual key, a page for the answers not yet revealed, and a button that links that to the fourth page which has the answers revealed and vice versa. I can't seem to figure out how to center that button so it looks cleaner.

<a href="real_answer.html"><button id="button">Show</button></a>
/* Button Styling */
#button {
  background-color: #6ab47b;
  -moz-border-radius: 15px;
  -webkit-border-radius: 15px;
  border: 5px solid #599a68;
  padding: 5px;

/* Button Font */
#button {
  font-family: 'Changa One', sans-serif;
  margin : 3px 0;
  font-size: 1em;
  font-weight: normal;
  line-height: 0.8em;
  color: #fff;



margin: 0 auto;



1 Answer

P.S. I am following along and modifying the page of the "How to Make a Website" course.