[SOLVED] Celsius - Fahrenheit Button Not Working

[SOLVED] Celsius - Fahrenheit Button Not Working
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#1

Here’s my work: http://codepen.io/xenorath/pen/jrzpON
I’ve spent hours trying to find our why the buttons are not working. What was wrong?
Please help. Thank you.

Regards,
Richard

Edit: Just realized I mistook class for id. Sorry I’m stupid.