Click for demo here . Do as its done in video step by step. Good luck !

Step 0
Click above demo link. Works on desktop only. Make sure you open this page on Desktop only.

Step 1
Press ("Ctr + Shift + J") to open console.

Step 2
Click to copy "Magic Coding Tutorial Script" will be used in step 4.

Step 3
Click here to load Leetcode coders on this page. Also read step 4, before Leetcode opens up.


Step 4
Paste Magic script in console, when Leetcode opens up.

Note: Now get ready to see the magic. You will just have to follow the instructions after copying the script in leetcode and it will ask you to paste the script again in the console.