header {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo a{
  color: gray;
  text-decoration: none;
}
nav a {
  text-decoration: none;
  color: gray;
  margin-left:2em;
  transition: 0.3s;
}
nav a:hover{
    color:darkgrey;
}