body {
  padding: 1%;
  font-family: Arial;
}

#wrapper {
  max-width: 768px;
  margin: 30px auto;
}

h1 {
  margin: 35px 0;
  letter-spacing: 2.5px;
}

nav {
  font-size: 1.2em;
  background-color: #27ae60;
}

#mobile-nav-trigger {
  display: none;
  width: 100%;
  padding: 20px;
  font-size: inherit;
  font-weight: bold;
  letter-spacing: 2.5px;
  border: 0;
  cursor: pointer;
  color: #fff;
  background-color: inherit;
}

#mobile-nav-trigger.active { background-color: #2ecc71; }

nav ul {
  overflow: hidden;
  margin: 0;
  padding: 0;
  list-style: none;
}

nav li { float: left; }

nav li a {
  display: block;
  padding: 15px;
  text-decoration: none;
  color: #fff;
}

nav li a:hover {
  background-color: #2ecc71;
  -webkit-transition: all 0.4s ease 0s;
  -moz-transition: all 0.4s ease 0s;
  -o-transition: all 0.4s ease 0s;
  transition: all 0.4s ease 0s;
}
 @media screen and (max-width: 768px) {

nav li {
  float: none;
  text-align: center;
  border-top: 1px solid #fff;
}
}