For pure yellow background you can use:

a. #include "colors.inc"
    background {Yellow}

b. #include "colors.inc"
    background {color Yellow}

c. #include "colors.inc"
    background {color rgb Yellow}

d. #include "colors.inc"
    background {Red + Green}

e. background {<1, 1, 0>}

f. all above

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