@aws-amplify/ui/src/Nav.css

.navBar {
  position: relative;
  border: 1px solid transparent;
  border-color: #e7e7e7;
  background-color: #fff;
}

.navRight {
  text-align: right
}

.nav {
  padding: 10px;
}

.navItem {
  display: inline-block;
  padding: 10px 5px;
  line-height: 20px;
  margin-right: 12px;
}