Your colleague specified the <div> block to be 100vw width.
He expected the block to be exactly as wide as the viewport.
He also added padding and border to the block.
The block has become wider than the viewport, which causes horizontal scrolling at the bottom.
Probably colleague completely forgot about the block model.
Without changing the existing styles, make the block 100vw wide.

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<!DOCTYPE html>
    <title>Box model</title>
      body {
        margin: 0px;
      div {
        border: 1px solid red;
        width: 100vw;
        padding: 10px 40px;
      HTTP is a Client/Server communication model where the client makes a request to a server, and the server responds to that message.