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

}

body {background-repeat: no-repeat; 
    background-position:center;
    background-size: cover;
    background-attachment: fixed;

}

#header {
    background-color: rgb(109, 158, 158);
    flex-direction: row;    /* alina en columnas */
    margin:auto;
    width:100%;
    height:15%;
    font-family:Arial, Helvetica, sans-serif;
    
}

ul, ol {
    list-style:none;
}

.nav > li {
    float:left;
}

.nav li a {
    background-color: darkblue;
    color:#fff;
    text-decoration:none;
    padding:10px 12px;
    display:block;          /*    */
}

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

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

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

.nav li ul li {
    position:relative;
}

.nav li ul li ul {
    right:-140px;
    top:0px;
}
footer {
    background-color: black;
    position: absolute;
    bottom: 0;
    width: 100%;
    color: white;
}	
.botonSubmit {
    background: darkgray;
    border: 20px;    /* none; */
    border-radius: 200px;
    cursor: pointer;
    display: flexbox;
    font-family: 'Roboto', sans-serif;
    font-size: 18px;
    font-weight: bold;
    padding: 5px;
    text-align: center;
    width: 20%;
}

.titulo {
background: #e6f703;
border-radius: 100px;
/*      background-color: #FFD600; /* no se si es necesario */
font-size: 16px;
font-family: 'Roboto', sans-serif;
width: 25%;
padding: 5px;

}