body {
    background-color: grey;
    color: white;
    font-family: Arial;
    font-size: 2.5;
}

#main {
  display: flex;
  flex-flow: row wrap;
}

#sidebar {
  background-color: Green;
  width : 100%;
  margin-left: 0%;
}

#sidebar ul{
  text-transform: uppercase;
  list-style: none;
  padding: 0;
}

#content {
  background-color: black;
  width: 60%;
  margin-right: 10%
}
#navigation_bar{
  border: 1px Green;
  background-color: Green;
}
a {
  text-decoration: White;
}