nav {
    width: 15%;
    background-color: var(--color-fondo);
    position: fixed;
    height: 100%;
    border-right: 1px solid var(--color-borde);
}

header {

    margin-left: 15%;
    padding: 40px 0px 20px 0px;


}

main {

    margin-left: 33%;

    width: 50%;
}