*{
    margin:0;
    padding:0;
}
header {
    width:1200px;
    height:300px;
    background-color:blue;
}
nav {
    width:1200px;
    height:200px;
    background-color:yellow;

}
.contenido{
    width:1200px;
    height:1000px;
    background-color:green;
}
footer {
    width:1200px;
    height:400px;
    background-color:red;
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0,0,0,0.2);
    padding: 12px 16px;
    z-index: 1;
    color:white;
}

.dropdown:hover .dropdown-content {
    display: block;
}
.dropdown-content p:hover {background-color: black}