Need help with aligning text on Codepen with Bootstrap

So trying to align some of the text on the page, but as soon as I put the Bootstrap CDN it aligns the text to the left. I’m not sure what is wrong, because the text-align doesn’t seem to work. Here is my CSS andCodepen.

body {
  background: ;
  text-align: center;
  margin-top: 30px;

.intro {
  font-family: Sans-serif;
  font-size: 35px;
  font-color: ;
.instructions {
  font-size: 25px;
  font-weight: 800;
  font-color: white;

Add col-sm-12 class to your div element with the class instruction.

So it would like something like this:

<div class="instructions col-sm-12">

Bootstrap uses flexbox, it’s happening due to that.

I won’t go into the details of flexbox here, you can check out detailed docs on MDN or videos on youtube. (or just check out the Bootstrap docs)