side-menu {
  display: block;
  box-sizing: border-box;
}

api-info, side-menu {
  display: block;
  padding: 10px 20px;
}

side-menu {
  position: fixed;
  width: 260px;
  height: 100%;
  overflow-y: auto;
  overflow-x: hidden;;
  background-color: #f2f2f2;
}

.api-content {
  margin-left: 260px;
}