.back-to-top a {
    text-decoration: none;
    font-size: 20px;
    color: white;
  }
  .back-to-top {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: #000;
    width: 20px;
  }
  .bottom-box {
    width: 100vw;
    height: 1em;
    background-color: black;
    border: 2px solid white;
  }
     /* BMI Calculator Table */
  
  .table th, .table td {
    border: 1px dotted #0c0c0c; 
    padding: 10px;
    text-align: center;
  }
  .table th {
    border-bottom: 2px solid #292929; 
  }
  .middle-line td {
    border-top: 2px solid #000;
  }

  .table {
    border-collapse: collapse;
    width: 100%;
  }