body{
  margin: 0 auto;
}
header{
  width: 100%;
  height: 100vh;
  background-color: #000;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}
ul{
  width: 160px;
  height: auto;
  display: flex;
  flex-direction: row;
  justify-content: space-around;
  align-items: center;
  margin-top: 20px;
  padding: 0;
}
li{
  width: auto;
  height: auto;
  list-style: none;
  margin: 0;
}