index6.css

body {
  margin: 0;
  padding: 0;
}

.container {
  padding: 100px;
}

/* CSS */
.box {
  margin: 15px;
  padding: 20px;
  width: 90px;
  height: 90px;
  background-color: #1899d6;
  color: #fff;
  font-weight: bold;
}

.center {
  text-align: center;
}

.coluna {
  display: inline-block;
  width: 45%;
  vertical-align: text-top;
}