body {
  background-color: #f8fafc;
}

.wrapper {
    margin: 0 auto;
    display: inline-block;
    padding: 20px;
    width: 70%;
    height:60vh;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.czytnik {
    display: inline-block;
    text-align: center;
    position: absolute;
    left: 50%;
    bottom: -30%;
    transform: translate(-50%, -10%);
    color: #fff;
    background-color: #3490dc;
    border-color: #3490dc;
    padding: 50px 100px;
    font: 400 13.3333px Arial;
    font-size: 30px;
    font-weight: 400;
}

.czytnik:hover {
    box-shadow: 0 0 rgb(103, 88, 184);
    color: #fff;
    background-color: #227dc7;
    border-color: #2176bd;
}

.main-text {
    text-transform: uppercase;
    font-family: 'Nunito', sans-serif;
    font-weight: 500;
  	text-shadow: 0 0 2px rgba(56, 55, 55, 0.6);
    color: #636b6f;
    text-align: center;
    font-size: 12vh;
}

@media (max-width: 1300px) {
    .wrapper {
      height: 50%;
  }  
  .main-text {
      font-size: 9vh;
      width: 100%;
    }
  }

  @media (max-width: 870px) {
    .wrapper {
        height: 35%;
    }
    .main-text {
      font-size: 3.5em;
      line-height: 10vh;
      width: 100%;
    }

    .czytnik {
        bottom: -30%;
        transform: translate(-50%, -10%);
        padding: 30px 50px;
        font-size: 25px;
    }
  }

  @media (max-width: 650px) {
    .wrapper {
        height: 30%;
    }
    .main-text {
      font-size: 2.7em;
      line-height: 6vh;
      width: 100%;
        padding: 20px 0;
    }
}