#obras{
    background: black;
    padding: 20px;
   }
   #texturas{
    background: black;
    padding: 20px;
   }
.obras{
  background-size: cover;
  background-repeat: no-repeat;
}
.textura{
    background-size: cover;
    background-repeat: no-repeat;
  }
  .whatsapp a i {
    position: fixed;
    right: 25px;
    bottom: 25px;
    width: 45px;
    height: 45px;
    background-color: green;
    border-radius: 60px;
    color: white;
    text-align: center;
    z-index: 2000;
  }
  .desc_txt{
    display: none;
  }