* {
  box-sizing: border-box;
}

body {
  font-family: arial;
}

ul {
  background: #333333;
  list-style: none;
  margin: 0;
  padding: 0;
}

li {
  display: inline-block;
  position: relative;
}

li:hover {
  background: red;
}

a {
  color: white;
  text-decoration: none;
  padding: 15px;
  display: inline-block;
}

img {
  width: 10px;
  float: right;
  margin-left: 5px;
}

ul li:hover > ul {
  display: inline-block;
}

ul ul {
  display: none;
  top: 100%;
  position: absolute;
  left: 0;
  background: #f9f9f9;
  box-shadow: 0 5px 20px 0px #0000001c;
}

ul ul a {
  color: black;
  width: 100%;
}

ul ul li {
  position: relative;
  width: 150px;
}

ul ul li:hover {
  background: #efefef;
}