* {
    box-sizing: border-box;
  }
  
  body {
    margin: 0;
  }

  .header {
    padding: 20px;
    text-align: center;
  }

  .line {
    border: 2px solid black;
  }

  .column {
    text-align: center;
    float: left;
    width: 50%;
    padding: 15px;
  }
 
  .row:after {
    content: "";
    display: table;
    clear: both;
  }

  table {
    width: 100%;
    border-collapse: collapse;
  }
  
  th, td {
    border: 1px solid black;
  }
  
  .wuerfel{
    display: inline-flex;
    padding: 3%;
  }