aside#sidebar {
  position: fixed;
  z-index: 200;
  top: 0;
  bottom: 0;
  left: 0;
  width: 260px;
  background: #fff;
  box-shadow: 3px 3px 10px rgba(0, 0, 0, 0.1);
  padding: 1.75rem 0.5rem;
  transition: left 0.3s ease-in-out;
}

@media (max-width: 768px) {
  aside#sidebar {
    width: 100%;
    max-width: 100vw;
  }

  aside#sidebar.active {
    left: 0;
  }
}