.logo {
  position: relative;
  display: inline-block;
  text-decoration: none;
  width: 42px;
  height: 42px;
}

.logo img {
  position: absolute;
  top: 0;
  left: 0;
  transition: opacity 0.2s ease-in-out;
}

.logo .logo-static {
  opacity: 1;
}

.logo .logo-hover {
  opacity: 0;
  pointer-events: none;
}