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[deanhystad]

I'm guessing you have a typo? I just ran with target = 111 and got

Output:
Greatest number less than 111 is at position 5 with value 102

What are you using for data? I used

1	sorted_list = [1, 2, 5, 6, 100, 102, 110, 140, 145]

If I type -111 I get

Output:
Greatest number less than -111 is at position -1 with value 145

But the demo does warn to be on the lookout for index == -1.