console 命令行工具 X clear

console

<div class="mask">
  <div class="dialog">
    hello world
  </div>
</div>

.mask {
  display: flex;
  height: 100vh;
  width: 100vw;

  background: #444;
  .dialog {
    padding:15px;
    margin:auto;
    background: #ccc;
  }
}