body {
  background: #f8f8f8;
  padding: 0.7em; }

.main {
  background: #f0f0f0;
  padding: 0px; }
  .main .right_side {
    float: right;
    width: 40%;
    background: #e5e5e5; }
  .main .knowledge_list {
    float: left;
    width: 60%; }

@media screen and (min-width: 914px) {
  body {
    width: 854px;
    margin: 0px auto; } }