.container-sm {
  margin: auto;
  /* border: 2px solid #313131; */
  margin-top: 150px;
  background-color: #9e9e9e;
  padding: 15px 15px 35px 15px;
}
.columna {
  margin: auto;
}

.navbarbrand.princ_contact_tit.princ_contact_tit {
  width: 100%;
  margin-bottom: 50px;
  font-size: 32px;
  font-weight: bold;
  /* color: #91cc06; */
  text-align: center;
}
/* .princ_contact_tit:hover {
  font-family: serif;
} */

.plant_contact input,
textarea {
  width: 100%;
  background: #282828;
  border: 1px solid #393939;
  padding: 7px 10px;
  margin: 0px 0px 10px 0px;
  background-color: #fafafa;
}

.plant_contact textarea {
  height: 100px;
  background-color: #fafafa;
}

.plant_contact .btn-secondary {
  /* background: #92bf24; */
  border: none;
  border-radius: 5px;
  color: #e9e9e8;
  font-weight: bolder;
  padding: 3% 15%;
  transition: 1s;
}

.plant_contact .btn-secondary:hover {
  background: #212529;
  /* este es el código color 'bg-dark' de boots */
  transform: scale(1.05);
}

button:hover:nth-child(1) {
  animation: shake1 0.4s;
}
@keyframes shake1 {
  0% {
    transform: translateX(0px);
  }
  25% {
    transform: translateX(-5px);
  }
  50% {
    transform: translateX(0px);
  }
  75% {
    transform: translateX(5px);
  }
}