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.barra-lateral {
      position: absolute;
      top: -100%;
      left: 0;
      width: 100%;
      background-color: rgba(0, 0, 0, 0.85);
      padding: 20px;
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 10px;
      transition: top 0.5s ease-in-out;
      z-index: 2;
    }

.barra-lateral.mostrar {
      top: 120px;
    }

.modulo-btn {
      background-color: black;
      color: white;
      border: 0px;
      padding: 12.5px 25px;
      font-size: 9px; 
      cursor: pointer;
      border-radius: 0px;
      transition: all 0.5s ease-in-out;
      text-size: 10px; /* Aumentamos el tamaño del texto */
    
    }

.modulo-btn:hover,
    .modulo-btn.active {
      background-color: white;
  
      color: black;
    }
  </style>
</head>
<body>

<div class="titulo">Curso HTML</div>
  <div class="barra lateral" r>
   <div class="barra-lateral" id="barraModulos">
    
    <button class="modulo-btn">Módulo 1</button><button class="modulo-btn">Módulo 2</button><button class="modulo-btn">Módulo 3</button><button class="modulo-btn">Módulo 4</button><button class="modulo-btn">Módulo 5</button><button class="modulo-btn">Módulo 6</button><button class="modulo-btn">Módulo 7</button>
    </div>

<div class="barra-lateral" id="barraModulos">
  
  <script>
    function mostrarBarra() {
      document.getElementById("barraModulos").classList.toggle("mostrar");
    }
  </script>

</body>
</html>

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