* {
    margin: 0px;
    padding: 0px;
}

.main {
    height: 300px;
    margin: 10px;
    display: flex;
    gap: 2px;
}

.sidebar {
    background-color: lightblue;
    padding-top: 25px;
    flex: 1 1 auto;
}

.contenido {
    background-color: darkseagreen;
    padding: 10px 20px;
    flex: 8 1 auto;
}

.sidebar ul li {
    list-style-type: none;
    border-bottom: 1px solid black;
    margin-inline: 15px;
    padding: 10px;
}

a {
    color: black;
    text-decoration: none;
}