body {
    padding-top: 85px;
}

section {
    padding-top: 70px;
}    

.desk-img {
  display: block;
}

.mobile-img {
  display: none;
}

@media (max-width: 700px) {
  .desk-img {
    display: none !important;
  }
  .mobile-img {
    display: block;
  }
}