* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    margin: 20px 0;
    background-color: #f0f0f0;
    font-family: Arial, sans-serif;
    color: #333;
}

a {
    color: #007BFF;
    text-decoration: none;
    font-size: 16px;
    display: block;
    padding: 10px 0;
}

a:hover {
    color: #0056b3;
}

#contenedor {
    width: 70%;
    max-width: 1000px;
    margin: 0 auto;
    background-color: #fff;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
    border-radius: 8px;
    overflow: hidden;
}

#cabecera {
    background-color: #007BFF;
    color: #fff;
    padding: 20px;
    text-align: center;
}

#cabecera h1 {
    margin: 0;
    font-size: 24px;
}

#menu {
    background-color: #343a40;
    padding: 20px;
    width: 200px;
    float: left;
    height: calc(100vh - 120px);
    overflow-y: auto;
}

#menu ul {
    list-style-type: none;
}

#menu ul li {
    margin-bottom: 10px;
}

#menu ul li a {
    color: #fff;
    background-color: #495057;
    border-radius: 4px;
    padding: 10px;
    transition: background-color 0.3s;
}

#menu ul li a:hover {
    background-color: #6c757d;
}

#contenido {
    padding: 20px;
    margin-left: 220px;
    background-color: #f8f9fa;
    min-height: calc(100vh - 120px);
}

#contenido h2 {
    color: #343a40;
    margin-bottom: 10px;
    font-size: 22px;
}

#contenido p {
    margin-bottom: 20px;
    font-size: 16px;
    line-height: 1.5;
}

.display-frame {
    width: 100%;
    height: 500px;
    border: 2px solid #007BFF;
    border-radius: 4px;
}

#pie {
    background-color: #007BFF;
    color: #fff;
    text-align: center;
    padding: 10px;
    clear: both;
}