Survey form project, width problem

Hello team, I put the width of 600px to all my input and buttons, but i found the submit button and dropdown select area a little bit smaller than 600px. I don’t know why. link to my project: Thanks

It is because the default box-sizing is content-box.
Add this to your css:

* {
box-sizing: border-box;

you could read this

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Thank you very much Samolex, it works finally and I learned something new.
best regards

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