.logo-black,
.logo-white {
  position: absolute;
  left: 0;
  top: 0;
  width: 150px;   /* Задайте нужный вам размер */
  height: auto;
  transition: opacity 0.2s;
  opacity: 0;
  pointer-events: none;
}
.logo-black.show,
.logo-white.show {
  opacity: 1;
  pointer-events: auto;
}