/* quitar estilos por defecto*/
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body{
    font-family:arial;
}

/*memu pricipal*/
.menu ul{
    list-style: none;
    background: #333;
    display: flex;
}

.menu ul li{
    position: relative;
}

.menu ul li a{
    display: block;
    padding: 15px 20px;
    color: white;
    text-decoration: none;
}

/* hover*/
.menu ul li a:hover{
    background: #555;
}

/* submenu*/
.submenu{
    display: none;
    position: absolute;
    background: #444;
    top: 100%;
    left: 0;
    flex-direction: column;
    min-width: 150px;
}

/* items submenu*/
.submenu li a{
    padding: 12px;
}

/*mostrar submenu*/
.dropdown:hover .submenu{
display: block;
}

.submenu{
    opacity: 0;
    visibility: hidden;
    transition: 0.3s;
}

.dropdown:hover .submenu{
    opacity: 1;
    visibility: visible;
}