body {
  background-color: #000;
  color: #fff;
  font-family: Helvetica Neue,Helvetica,Arial,sans-serif;

  height: 100%;
  width: 100%;
  position: fixed;
  margin: 0;

  display: flex;
  align-items: center;
  justify-content: center;
}

a {
  color: #fff;
}

a:hover {
  color: rgb(48, 131, 251);
}

.main {
  width: 680px;
  height: 680px;
}

.box {
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;

  height: 300px;
  width: 300px;
  padding: 20px;
  float: left;
}