142 ?> <!doctype html> <html lang="en"> <head> <!-- Required meta tags --> <meta charset="utf-8"> <meta name="viewport" content="width=devicewidth, initial-scale=1, shrink-to-fit=no"> <!-- Bootstrap CSS --> <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/ 4.4.1/css/bootstrap.min.css" integrity="sha384Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9 MuhOf23Q9Ifjh" crossorigin="anonymous"> <link rel="stylesheet" href="css/style.css"> <title><?= $judul ?></title> </head> <body> <div class="cover-container d-flex w-100 h-100 p-3 mx-auto flex-column"> <header class="masthead mb-auto"> <div class="inner"> <h3 class="masthead-brand"><?= $judul ?></h3> <nav class="nav nav-masthead justifycontent-center"> <a class="nav-link active" href="index.php">Home</a> <a class="nav-link" href="pages/example.php">Examples</a> <a class="nav-link" href="pages/about.php">About Us</a> </nav> </div> </header> <main role="main" class="inner cover"> <div class="card"> <div class="card-body"> <h1 class="cover-heading"><?= $materi; ?></h1> <p style="font-size: 20px;">A quarterwave impedance transformer, often written as λ/4
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