@import url(https://fonts.googleapis.com/css?family=Open+Sans);
body {
  padding: 0;
  margin: 0;
  font-family: 'Open Sans';
}

.op-app {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.op-centrar-componentes {
  display: flex;
  justify-content: center;
  align-items: center;
}