Wow...! Can't wait to make this (and show my Friends that even an Old Fart can still make things! At nearly 78 y.o., it's a little HARD learning things, especially Electronics...!). Lol...
Beautiful project, but LEDs being connected directly in parallel is not a good choice, because semiconductors has a barrier voltage characteristics, that may vary on each LED (silicon and another diodes have it too) the noticeable effect is that certain LEDs can be brighter than others, you can avoid it placing carbon resistors between each LED and the +B line... Best regards...
Sir when i make led chaser using cd4017 and 555ic it can run only 10 led and when i connect 10 other led then 10 led not work only 10 led work what is the solution of this problem 😢😢😢😢