console 命令行工具 X clear

console

<div class="father">
  <div class="box first">
    一
  </div>
  <div class="box">
    二
  </div>
  <div class="box">
    三
  </div>
</div>

.box {
  background-color: gray;
  width: 100px;
  height: 30px;
  margin: 10px 10px;
}

.first {
  float: right;
}

.father {
  width: 300px;
  border-style: solid; 
  border-width: 2px;
}