Green background and black text [Intel 8086]

.8086
.model small
.stack 2048

;there's no data segment because it's not needed
cseg    segment para public 'code'
assume  cs:cseg

Main  proc
    mov ax,0b800h       ;B800 is the video memory adress
    mov es,ax           ;move that adress to es
                        ;es stands for "extra segment"


    mov bx, ' '         ;space to bx. A space is what we will write in screen (to clean)
    xor di, di          ;di -> 0
    mov cx, 24*80       ;24*80 is the size of window! 24 lines,80 columns
    mov bl, 00100000b   ;[0][010][0000]b -> binary (*see below)
ciclo:
    mov bh, es:[di] ;get screen data (text)

    mov es:[di], bh     ;move the space to video adreess (in other words, write a space on screen)
    mov es:[di+1], bl
    add di, 2           ;every video adress have a size of word, so let's add 2
    loop ciclo          ;repeat until cx = 0, In every loop, cx is decremented


    mov ah,4CH
    int 21H
main    endp

cseg    ends
end     main

;the first 0 means static, if 1, text will be blinking
;the next 3 digits is for brackground color [000-111]
;the next 4 digits is for text color [000-1111]
;colors
;black          0000
;blue           0001
;gren           0010
;cyan           0011
;red            0100
;magenta        0101
;brown          0110
;light grey     0111
;dark grey      1000
;light blue     1001
;light green    1010
;light cyan     1011
;light red      1100
;light magenta  1101
;yellow         1110
;white          1111