body {
    margin: 0;
    font-family: Arial, sans-serif;
    background: rgb(82, 0, 0);
}

.container {
    width: 900px;
    margin: auto;
    background: rgb(110, 0, 0);
}

/* HEADER */
header {
    background: #111;
    color: rgb(255, 255, 255);
    padding: 20px;
}

header h1 {
    margin: 0;
}

nav ul {
    list-style: none;
    padding: 0;
}

nav li {
    display: inline;
    margin-right: 15px;
}

nav a {
    color: rgb(255, 255, 255);
    text-decoration: none;
}

/* BANNER */
.banner {
    background: url("images/banner.jpg") no-repeat center;
    background-size: cover;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgb(255, 255, 255);
}

/* CONTENIDO */
.contenido {
    display: flex;
    padding: 20px;
}

article {
    width: 70%;
}

aside {
    width: 30%;
    padding-left: 20px;
}

aside img {
    width: 100%;
}

/* FOOTER */
footer {
    background: #111;
    color: rgb(255, 255, 255);
    text-align: center;
    padding: 10px;
}