.mainBox {
    margin-top: 4.3rem;
}
html {
    position: relative;
    min-height: 100%;
  }
  body {
    margin-bottom: 160px;
  }
.display-4 {
    font-size: 2.5rem !important;
    border-bottom:1px solid #dee2e6;
    padding-bottom:5px;
    margin-bottom:1.7rem;
}

  .footer {
    position: absolute;
    bottom: 0;
    width: 100%;
      left: 0;
    right: 0;
  }