.pagina-convocatorias {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

.convocatorias-principal {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 4rem 2rem;
  border: 8px solid yellow;
}

.mensaje-proximamente {
  font-size: 3rem;
  font-weight: 700;
  color: #ffffff;
  text-transform: uppercase;
  letter-spacing: 4px;
  background: linear-gradient(90deg, #fff, #aaa);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

@media (max-width: 900px) {
  .mensaje-proximamente {
    font-size: 2rem;
  }
}