.SEM {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
}

.box {
  flex: 1 1 30%;
  margin: 10px;
  padding: 20px;
  background-color: #f4f4f4;
  border: 1px solid #ddd;
  border-radius: 5px;
  text-align: center;
}

.box a {
  text-decoration: none;
  color: #333;
  font-weight: bold;
}

.box a:hover {
  color: #007bff;
}