Hello, Alessio! It would help if you replaced margin-top: 1em with 14px on line 36 of the file "style.scss" on .header. These are your settings:
.header { display: flex; align-items: center; font-size: 15px; margin-top: 1em; width: 100%; }
Put margin-top with 14px:
.header { display: flex; align-items: center; font-size: 15px; margin-top: 14px; width: 100%; }
If you do it, your problem is going to be solved, in other words, the sidebar.
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