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

#mheader {
    margin: auto;
    width: 100%;
    font-family:Arial, Helvetica, sans-serif;
    position: absolute;
    background-color: #000000;
    display: flex;
    justify-content: center;
    z-index: 1000;
    font-size: 18px;
}

ul, ol {
    list-style:none;
}

.nav > li {
    float:left;
    width: 130px;
}

.nav li a {
    background-color:#000;
    color:#fff;
    text-decoration:none;
    /*padding:10px 7px;*/
    padding: 2px 4px;
    display:block;
    text-align: center;
}

.navPrincipal{
    padding: 10px 7px;
}

.nav li a:hover {
    background-color:#434343;
}

.nav li ul {
    display:none;
    position:absolute;
    min-width:140px;
    /*padding: 0px 0px;*/
}

.nav li:hover > ul {
    display:block;
}

.nav li ul li {
    position:relative;
}

.nav li ul li ul {
    right:-140px;
    top:0px;
}