Solve the Puzzle of number system

1234567
Across
  1. 2. total number of digits in a number system
  2. 6. can have only 0's and 1's.
  3. 7. used in day to day life
Down
  1. 1. used in web development color codes
  2. 3. has 7 digits
  3. 4. The extreme left digit in a number system
  4. 5. value- The actual value of the digit in a number