background-color 

background-color: #f0f0f0;
background-image

Ich ändere mich!

background-repeat 

background-repeat: no-repeat;
background-repeat: repeat-x;


background-size



background-attachment

filter

Blurred 
filter: blur(5px);
filter: brightness(150%);
filter: drop-shadow(5px 5px 5px gray);

opacity

50% Opacity
opacity: 0.5;
RGBA Colors