|Unclear. Is the Desktop offset, or just your browser ("the internet")? Rather important detail...|
If it is just your browser, just drag it back, and Maximize it. If it is your whole Desktop, then that's a monitor setting, usually accessible through control buttons on the front (below the screen). Often, you first have to select a menu, and scroll to the appropriate option, usually indicated by a small rectangle horizontally-offset from a larger rectangle or if "squeezed" vertically represented by a double-ended arrow symbol [↔]. We can't guess without knowing the exact monitor brand/number.