body {
  background-color: #333333;
  font-family: Ubuntu;
  color: #d1e751;
  size: 30px;
  text-align: center;
  font-size: 30px
}

div {
  font-family: Ubuntu
}

a {
  text-align: center;
  font-family: Ubuntu;
  color: #d1e751;
  text-decoration: none
}

.flexbox { … }
@media (min-width: 300px) {
   .flexbox { max-width: 530px; display: flex; flex-wrap: wrap }
   .fb { width: 49%; }
}
@media (min-width: 600px) {
   .flexbox { max-width: 1000px; display: flex; flex-wrap: wrap }
   .fb { width: 49%; }
}
@media (min-width: 1260px) {
   .flexbox { max-width: 1580px;}
   .fb { width: 25%; }
}