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<html lang="en"><head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet"> <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script> <style> body { position: relative; } </style></head><body data-bs-spy="scroll" data-bs-target=".navbar" data-bs-offset="50"><nav class="navbar navbar-expand-sm bg-dark navbar-dark fixed-top"> <div class="container-fluid"> <ul class="navbar-nav"> <li class="nav-item"> <a class="nav-link" href="#section1">Section 1</a> </li> <li class="nav-item"> <a class="nav-link" href="#section2">Section 2</a> </li> <li class="nav-item"> <a class="nav-link" href="#section3">Section 3</a> </li>