@media (prefers-color-scheme: dark) {

  html, body, #app {
    width: 100vw;
    height: 100vh;
    padding: 0;
    margin: 0;
    font-family: fangsong;
    font-weight: 300;
    overflow: hidden;
    position: relative;
  }

  html {
    background-color: #333333;
    color: white;
  }

  #watermark_box {
    width: 100vw;
    height: 100vh;
    position: absolute;
    z-index: -1;
    overflow: hidden;
  }

  .drag-box {
    width: 100px;
    height: 100px;
    background: aliceblue;
    border-radius: 6px;
    text-align: center;
    cursor: move;
    position: absolute;
    right: 20px;
    bottom: 20px;
    color: black;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 99;
    overflow: hidden;
  }
}