.thumb {
  cursor: pointer;
  transition: 0.3s;
}
.thumb:hover {
  opacity: 0.8;
}

.modal-body {
  position: relative;
}

.nav-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  font-size: 2.5rem;
  color: white;
  opacity: 0;
  transition: opacity 0.3s;
  cursor: pointer;
  z-index: 10;
  user-select: none;
}

.nav-arrow:hover {
  opacity: 1 !important;
}

.modal-body:hover .nav-arrow {
  opacity: 0.7;
}

.nav-left {
  left: 20px;
}

.nav-right {
  right: 20px;
}