html {
    background: #ccc;
    font-family: Verdana;
}
body {
    margin: 0 auto;
    max-width: 1200px;
    background: white;
}


/* Header */
header {
    background: #61ce70;
    height: 100px;
}

header h1 {
    font-size: 50px;
    color: white;
    text-align: center;
    padding-top: 15px;
}

/* Nav */
nav {
    padding: 20px 40px;
}

ul.dropdown, .dropdown ul, .dropdown li {
    margin: 0;
    padding: 0;
    display: block;
}
.dropdown li ul {
    display: none;
}

.dropdown li {
    float: left;
    padding: 5px;
    position: relative;
}
.dropdown a {
    padding: 15px 30px;
    background: white;
    display: block;
    color: black;
    font-weight: bold;
    text-decoration: none;
    font-size: 18px;
}

.dropdown li:hover > ul {
    display: block;
    position: absolute;
    top: 100%;
    left: 0;
}
.dropdown li:hover > a {
    border-bottom: 3px solid #61ce70;
}
.dropdown li li {
   float: none;
}
.dropdown li li a {
   background: #ccc;
}