.bang:hover{

	        color:red;
	    }
	    .labe {
	font-size:20px;
	color:#fff;
	line-height:3em;
	width:6em;
	background:#8000ff;
	position:absolute;
	left:0;
	top:0;
	z-Index:2;
	-webkit-transform-origin:right bottom;
	-moz-transform-origin:right bottom;
	transform-origin:right bottom;
	-webkit-transform:translate(-29.29%,-100%) rotate(-45deg);
	-moz-transform:translate(-29.29%,-100%) rotate(-45deg);
	transform:translate(-29.29%,-100%) rotate(-45deg);
	text-indent:0;
	text-align:center;
}
  .corner::before {
    position: absolute;
    top: 1rem;
    left: -0.5rem;
    z-index: 1;
    padding-right: 0.625rem;
    font-weight: bold;
    line-height: 0px;
    color: #000;
    height: 0px;
    border: 1.3rem solid #ee7600;
    border-right-color: transparent;
    content: "　知识改变命运　";
    box-shadow: 0px 0.3125rem 0.3125rem -0.3125rem #000;
  }
  .copy::before{
      font-size:15px;
      display: block;
      width: 100%;
      position:absolute;
      bottom: 15px;
      left: 0;
      content: "©线上课堂2023　科凡定制";
  }
  .wdpassword::before{
      font-size:15px;
      display: block;
      width: 100%;
      position:absolute;
      bottom: 15px;
      left: 0;
      content: "文档密码：20221001";
  }