html, body, main {
  height: 100%; }

aside {
  width: 300px;
  height: 100%;
  float: left;
  overflow-y: auto;
  padding: 10px; }
  aside .logo {
    text-align: center; }
    aside .logo img {
      margin: 10px 0;
      width: 130px; }
  aside ul.categories {
    text-align: center; }

main #container {
  overflow: hidden;
  height: 100%; }