    
   #preview {
      width: 100%;
      height: 100%;
      border: 0px;
    }
    #preview_c {
      position: absolute;
      right: 2px;
      bottom: 30px;
      left: 2px;
      top: 50px;
    }
    #wait_tip{
      position: absolute;
      left: 25%;
      top: 20%;
      width: 50%;
      height: 100px;
      text-align: center;
      background: rgba(0, 0, 0, 0.6);
      font-size: 15px;
      margin: auto;
      padding-top: 40px;
      color: rgb(255, 255, 0);
      border-radius: 2em;
      z-index: 9999;
    }

    #qrcode{
        position: absolute;
        left: 40%;
        top: 20%;
        display: none;
    }

.login {
    margin: auto;
    margin-top: 100px;
    width: 800px;
    color: #fff;
    background-color: #FFFFFF;
    border-radius: 15px;
    min-height: 300px;
  }

.login-icon {
    margin: auto;
    width: 300px;
  }
.login-icon > img {
  display: block;
  width: 100%;
  margin-bottom: 6px;
  }

.login-form {
    padding-left: 60px;
    padding-right: 60px;
    background-color: #FFFFFF;
  }
.login-form .control-group {
  position: relative;
  margin-bottom: 6px;
  }
.login-form .login-field {
    font-size: 17px;
    text-indent: 3px;
    border-color: #1ABC9C;
  }
.login-form .login-field:focus {
  border-color: #1abc9c;
  }
.login-form .login-field:focus + .login-field-icon {
  color: #1abc9c;
  }
.login-form .login-field-icon {
  position: absolute;
  top: 3px;
  right: 15px;
  font-size: 16px;
  color: #bfc9ca;
  -webkit-transition: all .25s;
          transition: all .25s;
  }
footer {
    margin-top: 5px;
    text-align: center;
    color: #ffffff;
  }

