body {
  margin: 0;
  min-height: 100vh;
  background: url('CAMINHO_PARA_SUA_IMAGEM_DE_NUVEM_AQUI.png') repeat-x center top, #7ed3fa;
  font-family: Verdana, Geneva, Tahoma, sans-serif;
}
.menu-topo {
  background: #444;
  color: #fff;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 4px 0;
  font-size: 15px;
}
.menu-topo a {
  color: #ffd800;
  text-decoration: none;
  margin: 0 14px;
  transition: color 0.2s;
}
.menu-topo a:hover {
  color: #fff;
}
.container-titulo {
  background: rgba(255,255,255,0.97);
  margin: 36px auto 0 auto;
  max-width: 900px;
  border: 6px solid #bbb;
  box-shadow: 0 8px 40px #2224;
  padding: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.placeholder-titulo {
  width: 650px;
  height: 205px;
  background: #e2e2e2;
  border: 3px dashed #aabb44;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 36px;
  color: #7c9c1f;
  margin-top: 16px;
}
@media (max-width: 750px) {
  .placeholder-titulo { width: 90vw; font-size: 7vw; height: 22vw; }
  .container-titulo { padding: 4vw; }
}