.container {
    padding-right: 15px;
    padding-left: 15px;
    margin-right: auto;
    margin-left: auto;
  }
  input:invalid {
    border: 3px solid red;
  }
  .buttonBox{
    text-align: center;
    padding:20px;
    margin-bottom: 20px;
  }
  .buttonBox .btn-green{
    padding:10px 20px;
    background-color: #24b67e;
    border: none;
    color: #fff;
    font-size: 20px;
    margin: 5px;
    cursor: pointer;
    text-decoration: none;
  }
  .tablinks:hover{
    background-color: #94d6bd;
  }
  .tablinks.active{
    background-color: #94d6bd;
  }
  @media (min-width: 768px) {
    .container {
      width: 750px;
    }
  }
  @media (min-width: 992px) {
    .container {
      width: 970px;
    }
  }
  @media (min-width: 1200px) {
    .container {
      width: 1170px;
    }
  }