header {
  background: $nav-color;
  left: 0;
  padding: 10px;
  position: fixed;
  width: 100%;
  top: 0;
}

.nav-links {
  margin: 0;
  padding: 0;
  text-align: center;

  li {
    border-radius: 5px;
    display: inline-block;
    margin-right: 10px;
    padding: 7px;

    &:hover {
      background: darken($green, 5);
    }

    &:last-child {
      margin-right: 0;
    }
  }

  a {
    color: $nav-link-color;
  }
}

header {
  background: $nav-color;
  left: 0;
  padding: 10px;
  position: fixed;
  width: 100%;
  top: 0;
}

.nav-links {
  margin: 0;
  padding: 0;
  text-align: center;

  li {
    border-radius: 5px;
    display: inline-block;
    margin-right: 10px;

    &:hover {
      background: darken($green, 5);
    }

    &:last-child {
      margin-right: 0;
    }
  }

  a {
    color: $nav-link-color;
    display: block;
    padding: 7px;
  }
}

Make entire nav link clickable
Make entire nav link clickable
