hexadecimal-emiter requirement

1. Every time you run the program, it should emit one 8-digit hexadecimal code;
2. It should emit every possible code before repeating;
3. It should not print "odd-looking" codes such as 0xAAAAAAAA or 0x01234567 or any commonly used words, phrases, or hexspeak such as 0xDEADBEEF;
4. Codes should be emitted in apparently random order.

Added bg-color using generated hexadecimal

    document.body.style.backgroundColor = '#' + result;
    document.getElementById('gen_hex_txt').style.backgroundColor = '#' + result;