style.css

* {
    padding: 0;
    margin: 0;
}

h1 {
    color: aliceblue;
    font-size: 3rem;
    text-align: center;
    padding: 2rem;
}

body {
    font-family: Arial, Helvetica, sans-serif;
}

header {
    height: 150px;
    background-color: orange;
}

nav {
    padding: 20px;
    background-color: olive;
}

nav a {
    text-decoration: none;
    color: white;
    font-weight: bold;
    margin-right: 20px;
}

nav a:hover {
    color: black;
}

main {
    display: flex;
}

section {
    padding: 20px;
    width: 65%;
}

section h1 {
    margin-bottom: 10px;
}

section iframe {
    width: 100%;
    border: none;
    margin-bottom: 10px;
}

aside {
    padding: 20px;
    width: 35%;
}

footer {
    background-color: black;
    color: white;
    font-weight: bold;
    text-align: center;
    padding: 20px 0;
}

.flex {
    display: flex;
    justify-content: space-between;
    border-top: 1px solid #CCC;
    margin-top: 10px;
    padding-top: 10px;
    margin-bottom: 10px;
}

.flex span {
    display: block;
}

.flex button {
    background-color: red;
    color: white;
    font-weight: bold;
    text-transform: uppercase;
    border: none;
    cursor: pointer;
    padding: 0 10px;
}

aside a {
    display: flex;
    text-decoration: none;
    color: black;
    margin-bottom: 10px;
}

aside a h2 {
    font-size: 14px;
    margin-bottom: 5px;
}

aside a span {
    display: block;
    font-size: 14px;
}

.contenedor {
    padding-left: 10px;
}