diff --git a/cs/index.css b/cs/index.css
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diff --git a/js/index.js b/js/index.js
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diff --git a/lobby.php b/lobby.php
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+++ b/lobby.php
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+<!DOCTYPE html>
+<html lang="es">
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+
+    <title>Trivial</title>
+
+    <!-- Bootstrap -->
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css"
+          rel="stylesheet">
+
+    <link rel="stylesheet" href="style.css">
+</head>
+
+<body>
+
+    <main class="container py-4">
+
+        <!-- BOTÓN CREAR SALA -->
+        <div class="text-center mb-4">
+            <button class="btn btn-dark"
+                    data-bs-toggle="modal"
+                    data-bs-target="#modalCrearSala">
+                Crear sala
+            </button>
+        </div>
+
+
+        <!-- CONTENEDOR DE SALAS -->
+        <div id="contenedorSalas"
+             class="row justify-content-center g-4">
+
+        </div>
+
+    </main>
+
+
+    <!-- MODAL CREAR SALA -->
+    <div class="modal fade" id="modalCrearSala" tabindex="-1">
+        <div class="modal-dialog">
+            <div class="modal-content">
+
+                <div class="modal-header">
+                    <h5 class="modal-title">Crear sala</h5>
+
+                    <button type="button"
+                            class="btn-close"
+                            data-bs-dismiss="modal">
+                    </button>
+                </div>
+
+                <div class="modal-body">
+
+                    <label for="nombreSala" class="form-label">
+                        Nombre de la sala
+                    </label>
+
+                    <input type="text"
+                           id="nombreSala"
+                           class="form-control"
+                           placeholder="Introduce un nombre">
+
+                </div>
+
+                <div class="modal-footer">
+
+                    <button type="button"
+                            class="btn btn-secondary"
+                            data-bs-dismiss="modal">
+                        Cancelar
+                    </button>
+
+                    <button type="button"
+                            class="btn btn-primary"
+                            id="btnCrearSala">
+                        Crear sala
+                    </button>
+
+                </div>
+
+            </div>
+        </div>
+    </div>
+
+
+    <!-- Bootstrap JS -->
+    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js"></script>
+
+    <!-- Nuestro JS -->
+    <script src="script.js"></script>
+
+</body>
+
+</html>
