body {
    background-color:hsl(196, 100%, 50%);
}
nav {
    max-width: 900px;
    margin: auto;
    background-color: #333;
    font-size: 20px;
    margin-top: 50px;
}
.menu-horizontal {
    list-style: none;
    display: flex;
    justify-content:space-around;
}
.menu-horizontal > li > a {
    display: block;
    padding: 15px 20px;
    color: white;
    text-decoration: none;
}
.menu-horizontal > li:hover {
    background-color: red;

}
.menu-vertical {
    position: absolute;
    display: none;
    list-style: none;
    width: 200px;
    background-color: rgba(red, green, blue, .5)
}
.menu-horizontal li:hover .menu-vertical{
    display: block;
}
.menu-vertical li:hover{
    background-color: black;
}
.menu-vertical li a {
    display: block;
    color: white;
    padding: 15px 15px 15px 20px;
    text-decoration: none;
}
#call {
    text-align: center;
}