Item boxes are coming out of container

#1

please help me fix it and tell me where i am wrong.

here is my html code https://ide.codingblocks.com/s/441554

here is my css code https://ide.codingblocks.com/s/441555

#2

It is because you did not put end tag of container div () after items.
Here is the correct code:
https://www.w3schools.com/tryit/tryit.asp?filename=tryhtml_default

#3

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