header {
  background-color: #dddddd;
  height: 100px;
}

.main {
  background-color: lightblue;
  height: 300px;
}

footer {
  background-color: #dddddd
  }

.header-list li {
  list-style: none;
  float: left;
  padding: 35px 20px;
}

.header-logo {
  color: green;
  font-size: 30px;
  float: left;
  padding: 30px 40px;
}

span {
  color: blue;
}