gistfile1.txt

1) HTML:
<!-- New case -->
<div class="container card">
  <div class="card-body">

    <div class="row">
      <div class="col-12">
        <ngb-tabset class="new-case-details-tabset">

          <ngb-tab title="Widok formularza sprawy">
            <ng-template ngbTabContent>
              <p>Dokument pdf Oli?</p>
            </ng-template>
          </ngb-tab>

          <ngb-tab title="Pliki żródłowe i komentarze">
            <ng-template ngbTabContent>

              <div class="row">
                <div class="col-8">
                  <p class="center-line"></p>
                </div>
                <div class="col-4 text-right">
                  <p>Sprawa<span>MKW/0326/JZ/2018</span><span>sąd</span></p>
                </div>
              </div>

              <form>
                <div class="row">
                  <div class="col-12">
                    <div class="form-group">
                      <label for="exampleFormControlTextarea1">Komentarze</label>
                      <textarea class="form-control" id="exampleFormControlTextarea1" rows="3"></textarea>
                    </div>
                  </div>
                </div>
              </form>

              <div class="row">
                <div class="col-12">
                  <p>Pliki</p>
                </div>
              </div>

            </ng-template>
          </ngb-tab>

        </ngb-tabset>
      </div>
    </div>

  </div>
</div>

2) CSS:
.container {
  margin-top: 5rem;
  padding: 0;
}

.card {
  margin-top: 5rem;
}
.card-body {
  padding: 0;
}

.center-line {
  width: 100%;
  text-align: center;
  border-bottom: 1px solid #000;
  line-height: 0.1em;
  margin: 10px 0 20px;
}
p span {
  background: #fff;
  padding: 0 10px;
}

3) MAIN CSS:
body {
  background-color: #f8f8f8;
}

.new-case-details-tabset .nav .nav-item .nav-link {
  width: 569px;
  text-align: center;
  color: grey;
  border-top: none;
}

.new-case-details-tabset ul li:first-child a {
  border-left: none;
}

.new-case-details-tabset ul li:nth-child(2) a {
  border-right: none;
}

.new-case-details-tabset .tab-content {
  padding: 3rem;
}