Floating Labels in Bootstrap

Hello all,

I’m working on the personal portfolio project and am trying to re-create the float labels for fields founds on the contact section: https://codepen.io/FreeCodeCamp/full/YqLyXB/

Does anyone have any good references to get this effect? I’ve tried reading around a lot, but found the examples way too complex to work with my current code: http://codepen.io/drustin/pen/QdmKdN

Thanks a lot!