nav {
  box-sizing: border-box;
  float: left;
  width: 100%;
  background: #0070c0;
  font-size: 16px;
}

nav ul {
  margin: 0;
  padding: 0;
}
 
nav p {
  display: block;
  color: #fff;
  text-decoration: none;
}
 
nav a {
  display: block;
  color: #fff;
  text-decoration: none;
}

nav ul li {
  position: relative;
  float: left;
  list-style: none;
}
 
nav ul li:hover {
  background: #4096ee;
}
 
nav ul li p {
    padding: 20px;
}

nav ul li a {
    padding: 20px;
}

nav ul ul {
  position: absolute;
  top: -9999px;
  left: -9999px;
  background: #0070c0;
  box-shadow: 5px 5px 10px rgba(0, 0, 0, 0.6);
}
 
nav ul ul li {
  float: none;
  width: 200px;
  border-bottom: 1px solid #555;
}
 
nav ul ul li a {
  padding: 10px 20px;
}

nav ul li:hover > ul {
  top: 100%;
  left: 0;
}

nav ul ul li:hover > ul {
  top: 0;
  left: 200px;
}

nav ul li.submenu > a:after {
  position: relative;
  float: right;
  content: '';
  margin-left: 10px;
  margin-top: 5px;
  border-left: 5px solid transparent;
  border-right: 5px solid transparent;
  border-top: 5px solid #fff;
  border-bottom: 5px solid transparent;
}

nav ul ul li.submenu a:after {
  margin-left: auto;
  margin-right: -10px;
  border-left: 5px solid #fff;
  border-right: 5px solid transparent;
  border-top: 5px solid transparent;
  border-bottom: 5px solid transparent;
}

nav ul ul li:last-child {
  border-bottom: none;
}