.contenedor {
    width: 100%;
    display: flex;
    flex-direction: column;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    background: orange;
margin: 0px;
padding: 0px;
}



.contenedor .menu-img{
    margin-top: 40px;
    background-color: red;
}

.menu-btn{
    position: fixed;
    width: 100%;
    height: 40px;
    padding-top: 10px;
    text-align: center;
    background-color: orange;
    font-size: 1.5em;
}

.menu-btn a{
    text-decoration: none;
}