body {
  font-family: helvetica, sans-serif;
  background-color: whitesmoke;
}

#logo {
  float: right;
}

nav ul {
  float: left;
  list-style-type: none;
  margin: 0;
  padding: 0;
}

section{
  margin-left: 150px;
}

h1 {
  text-align: center;
}

img {
  display: block;
  margin-left: auto;
  margin-right: auto;
}