Icons not displaying properly

Hi,
Here are 2 screenshots of the issues I’m having (there are red circles around them):
https://www.downhome.me/wp-content/uploads/2015/06/screenshot2.jpg
https://www.downhome.me/wp-content/uploads/2015/06/screenshot3.jpg
Fist is the “back to top of page” button is not displaying properly and second is the archives button is not displaying properly. Can anyone help me fix this? My site is DownHome.Me.
Thanks in advance!
P.S. Does anyone know how to get rid of the yellow and the red in the “recent posts” and “categories” icons? I would like it to match the green…