.centrar {
  text-align: center;
}

table {
  width: 50%;
  margin: 0 auto;
  text-align: center;
}

tr {
  border: gray 1px solid;
}

th {
  border: gray 1px solid;
  background-color: #ececec;
  text-align: center;
  height: 30px;
}

td {
  border: #cccccc 1px solid;
  text-align: center;
}

tr:hover {
  background-color: #e4e9e7;
}