The sass code does not work: hover images and icons are not displayed. How to fix?

Question

css

Good health to all and Happy New Year!!!
Friends, help solve the problem. I'm trying to implement blocks (4 pieces) when hovering over which a picture should be displayed, and the text of the button should change, etc. I saw these blocks on the site www.sgs66.ru I really liked the effect with these blocks.
Right now I don't get icons, pictures, and some styles don't pick up ...
Here's what I write in main.sass:

#lp-offer
  padding-bottom: 105px
  margin-top: -145px
  button
    display: none
    width: 60%
    height: 44px
    color: #fff
    font-size: 17px
    position: absolute
    left: 20%
    bottom: 67px
  .col-lg-3
    height: 350px
    > div:hover button
      display: inline-block
  > div > div > div:nth-child(2) > .col-lg-3
    height: 422px
  .lp-icon
    width: 46px
    height: 46px
    margin-top: 43px
  .lp-icon1
    background: url(../img/ico-lp-offer-46px.png)
    background-position: 0 0
  .lp-icon2
    background: url(../img/ico-lp-offer-46px.png)
    background-position: 0 -46px
  .lp-icon3
    background: url(../img/ico-lp-offer-46px.png)
    background-position: 0 -92px
  .lp-icon4
    background: url(../img/ico-lp-offer-46px.png)
    background-position: 0 -138px
  .col-lg-3
    > div
      height: 96.4%
      margin: 6px
      padding: 7px
      background-color: #fff
      box-shadow: 0 0 10px rgba(100, 100, 100, 0.3)
      > div
        height: 100%
        border: 2px solid #32d3ff
        > p
          &:nth-child(2)
            font-size: 21px
            padding-top: 27px
          &:nth-child(3)
            padding-top: 15px
    > div:hover
      > div
        border: 2px solid #fff
        color: #fff
      .lp-icon
        -webkit-filter: invert(100%)
        filter: invert(100%)
  > div > div > div:nth-child(2) > div
    &:nth-child(1) > div:hover
      background: url(../img/team/1.jpg)
      background-size: 100%
    &:nth-child(2) > div:hover
      background: url(../img/team/2.jpg)
      background-size: 100%
    &:nth-child(3) > div:hover
      background: url(../img/team/3.jpg)
      background-size: 100%
    &:nth-child(4) > div:hover
      background: url(../img/team/2.jpg)
      background-size: 100%

Here is the html structure:

<div  class="conteiner" id="lp-offer">
        <div class="row">
          <div class="col-lg-3">
            <div>
              <div>
                <p><i class="lp-icon lp-icon1"></i></p>
                <p>Заголовок</p>
                <p>Подзаголовок. Текст разный.</p>
                <button class="btn btn-default" data-toggle="modal" data-target="#lp-order-form">
                  Заказать
                </button>
              </div>
            </div>
          </div>
          <div class="col-lg-3">
            <div>
              <div>
                <p><i class="lp-icon lp-icon2"></i></p>
                <p>Заголовок</p>
                <p>Подзаголовок. Текст разный.</p>
                <button class="btn btn-default" data-toggle="modal" data-target="#lp-order-form">
                  Заказать
                </button>
              </div>
            </div>
          </div>
          <div class="col-lg-3">
            <div>
              <div>
                <p><i class="lp-icon lp-icon3"></i></p>
                <p>Заголовок</p>
                <p>Подзаголовок. Текст разный.</p>
                <button class="btn btn-default" data-toggle="modal" data-target="#lp-order-form">
                  Заказать
                </button>
              </div>
            </div>
          </div>
          <div class="col-lg-3">
            <div>
              <div>
                <p><i class="lp-icon lp-icon4"></i></p>
                <p>Заголовок</p>
                <p>Подзаголовок. Текст разный.</p>
                <button class="btn btn-default" data-toggle="modal" data-target="#lp-order-form">
                  Заказать
                </button>
              </div>
            </div>
          </div>

        </div>
      </div>

Answer 1

codepen.io/anon/pen/MKwvVp?editors=110