und-color: #fff;
    }

    .line::before,
    .line::after {
      content: "";
      position: absolute;
      top: 0;
      height: 1px;
      left: -4px;
      width: 10px;
      background-color: #fff;
    }

    .line::after {
      top: 100%;
    }

    .height-calc {
      transform: rotateZ(-90deg);
      position: absolute;
      left: -35px;
      top: 44%;
    }

    @media (max-width: 768px) {
    body {
      padding: 30px;
    }

    .container, .plane, .element {
      width: 300px;
    }
  