body{
  font-family: sans-serif;
  margin: 0;
 background-color:lightblue;
}
div{
    display:flex;
    justify-content:space-between ;
    flex-wrap: wrap;
}
h1{
    text-align: center;
}
nav{
    text-align: center;
}
nav a{
    text-decoration: none;
    color:red;
    font-size:20px;
    background-color:yellow;
    padding: 10px;
    margin:20px;
}
nav a:hover{
    background-color: #9932CC;
    color:blue;
}
h2{
    text-align: center;
}
h3{
    text-align: center;
}
h4{
      text-align: center;
}