.blackboard .footer {
  color: #aaa;
}
.blackboard ul {
  padding-left: 0px;
}
.blackboard li {
  list-style: none;
}
.blackboard .bottom-tip {
  height: 30px;
}
.blackboard .bottom-tip-item {
  max-width: 500px;
  color: #AAA;
  text-overflow: ellipsis;
  word-wrap: break-word;
}
.blackboard-filter {
  margin: 10px 0;
}
.blackboard-main-content canvas {
  width: 100%;
  border: 1px solid #888;
  box-sizing: border-box;
}
