Problem with Child Theme

Hey! I am using the Catch-Box theme & I was interested to change some code, so I created a child theme. I basically first tried googling a guide & then did it by downloading the .zip on this page's tutorial - the result was the same. I have tried some stuff out already, I have my own header and I changed the background color etc. Now if I activated my child theme, the theme worked, but all the things I had changed on the design did not show. I didn't see my logo "header", the correct background color etc. What am I doing wrong? My page: www.taffos.pri.ee/wordpress Page design with child theme: https://postimg.org/image/s7joq1xhl/