make a navbar with a logo in a circle and a home and about us button color is black

.container-fluid {
  background-color: rgb(198, 225, 255);
}

.navbar-header{
  height: 80px;
}

.navbar-brand{
  padding: 20px;
  font-size: 20px;
  margin-left: 50px;
  font-family: 'Arvo', serif;
  color: black;
  background-color: white;
}

.navbar-nav li a{
  font-size: 20px;
  color: white;
  font-family: 'Arvo', serif;
  font-weight: bold;
}

.navbar-default .navbar-nav>li>a:hover, .navbar-default .navbar-nav>li>a:focus {
  background-color: rgba(255, 255, 255, 0.2);
  color: white;
}

.navbar-default .navbar-nav>li>a {
  color: black;
  font-size: 20px;
  font