style.css

body {
    background-color: #ffffff;
    color: #000000;
    font-family: Arial, sans-serif;
    text-align: center;
  }
  
  .knapsack {
    margin: 50px auto;

  }
  p{
    color: #000000;
  }
  table {
    width: 80%;
    margin: 0 auto;
  }
  
  .buttons {
    display: inline-block;
    /* margin: 10px; */
    padding: 10px;
    background-color: #666;
    border: none;
    border-radius: 5px;
    color: #fff;
    font-size: 16px;
    cursor: pointer;
  }
  
  .txtBox {
    padding: 10px;
    border-radius: 5px;
    border: none;
    font-size: 16px;
    width: 200px;
    margin: 10px;
    background-color: #666;
  }
  
  .populationTable {
    margin: 50px auto;

  }
  
  .BigButton {
    display: block;
    margin: 50px auto;
    padding: 20px;
    background-color: #666;
    border: none;
    border-radius: 5px;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
  }

  
  #secondphase {
    display: none;
    margin: 50px auto;
  }
  
  #text {
    margin-top: 50px;
  }
  
  #text span {
    font-weight: bold;
    margin-right: 10px;
  }
  
  #showGens, #mutation {
    height: 200px;
    overflow-y: scroll;
    margin-top: 10px;
    border: 1px solid #000000;
    padding: 5px;
  }