exemplo de aula

index.css

body, ul {
  margin: 0 0;
}

.wrapper {
  display: block;
  background-color: pink;
  height: 100vh;
  height: 100vh;
}

.nav {
  background-color: tomato;
  width: 100%;
  height: 64px;
  display: block;
  box-shadow: 0 0 1px rgba(0,0,0,0.14), 0 4px 14px rgba(0,0,0,0.22);

}


.nav ul {
  width: 300px;
  height: 100%;
  float: right;
  z-index: 1;
}

.nav ul li {
  float: left;
  list-style: none;
  height: auto;
  padding-top: 22px;
  margin-left: 30px;
  font-size: 17px;
}

.nav ul li a {
  text-decoration: none;
  color: #fff;

  font-family: 'Baloo Bhaijaan', cursive
}

.nav ul li a:hover {
  color: #000;;
}

.banner, .content {
  display: -webkit-flex;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}

.banner img {
  width: 80%;
  height: auto;
}

.content p {
  margin-left: 10%;
  margin-right: 10%;
  font-family: 'Open Sans', sans-serif;
  margin-bottom: 10%;
}

.contact-us {
  text-decoration: none;
  width: 200px;
  height: 50px;
  background-color: tomato;
  border-radius: 17px;
  text-align: center;
}

.contact-us:hover {
  opacity: 0.7;
}

.contact-us a {
  padding-top: 15px;
  display: block;
  width: 100%;
  height: 100%;
  text-decoration: none;
  color: #fff;
  font-family: 'Baloo Bhaijaan', cursive
}