CSS is broken!!!

Good day,

I recently messed with my CSS to remove the grid lines in my slider pictures and also remove the search box in my header and by doing so I messed up my blog completely. If you look under my slider there are numbers from 1-15 that werent there before. My footer is all messed up to and I dont know how to fix this! PLease help 🙂 Thanks !
http://www.le-bonheur-total.com