body {
  background-color: yellow;
  color: white;
  font-family: Arial;
}
img {
height: 400px;
width: 400px;
}
.topnav {
    background-color: #333;
    overflow: hidden;
}
.topnav a {
    float: left;
    color: #f2f2f2;
    text-align: center;
    padding: 14px 16px;
    text-decoration: none;
    font-size: 17px;
}
.topnav a:hover {
    background-color: #ffffff;
    color: red;
}