https://codepen.io/3jaz/full/ObJpNv/
I’m not sure if I used bootstrap entirely right. But it looks okay. Just in some places I wasn’t sure whether to use CSS or bootstrap like for margins. Any suggestions or comments?
This looks really nice!
I can’t see any problems in the way you’ve used Bootstrap. All you markup is nice and clean*.
The only slightly odd thing is using Javascript to change the CSS on the h1 tag - why not just add another class to the text you wanted to change and write it in CSS?
*Actually, the <h4> tag at the end is non-standard. You should avoid using h tags for decorative purposes. Use CSS for styling and HTML for structure.
Thank you 
I forgot that part about not using html only for styling purposes.