header {
  background-color: MediumAquaMarine;
  margin: 0px;
  padding-top: 30px;
  padding-right: 0px;
  padding-bottom: 30px;
  padding-left: 0px;
}
header h1 {
  margin: 0px
}
header h3 {
  margin: 0px;
}
nav.main_menu ul {
  list-style-type: none;
  padding: 0px;
  margin-top: 0px;
  margin-bottom: 0px;
}
nav.main_menu li {
  display: inline-block;
  margin: 0px;
  padding-top: 5px;
  padding-right: 0px;
  padding-bottom: 5px;
  padding-left: 0px;
}
nav.main_menu a:link, a:visited {
  padding: 10px;
}
nav.main_menu a:hover {
  background-color: MediumAquaMarine;
}