.center{
  margin: 0 auto 0 auto;
  max-width: 90%;
  width: 500px;
}
.center ul{
  display: flex;
  margin: 0;
  padding: 0;
  list-style: none;
}
.center li{
  flex: 1 1 auto;
  margin-right: 8px;
}
li:last-of-type{
  margin-right: 0;
}