.c-logo {
  display: inline-block;
  max-width: 100%;
}

.c-logo img {
  max-width: 100%;
  height: auto;
  display: block;
}
@media (max-width: 768px) {
  .c-logo img {
    max-width: 150px;
  }
}

@media (max-width: 480px) {
  .c-logo img {
    max-width: 120px;
  }
}