.corpo {
  display: flex;
  flex-direction: column;
  height: 100vh;
  background: var(--cor-fundo-1);
}


.corpo[class*='ativo']::after {
  content: '';
  position: fixed;
  width: 100%;
  height: 100%;
  background: var(--cor-fundo-1-75);
  top: 0;
  left: 0;
  overflow: hidden;
}

.txt-d {
  color: var(--cor-principal);
  font-size: inherit;
}

.btn {
  border: .1rem solid var(--cor-principal);
  background-color: var(--cor-fundo);
  padding: 1rem 3rem;
  font-size: 2rem;
  border-radius: .5rem;
  color: var(--branco);
  text-decoration: none;
}