.box {
  width: 100%;
  height: 100%;
  background: #fff;
  font-size: 15px;
  color: black;
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  .imgbox{ flex: 1; overflow: hidden; }
  canvas{ overflow: hidden; }
  .content,.center{
    width: 100%;
    height: 100%;
    overflow: hidden;
  }
}
.btnbox{
  display: flex;
  margin-bottom: 8px;
  button{
    margin-right: 6px;
  }
}

.selectBtn { background-color: #1890ff; color: #fff; }