@media print {
    .no-print, .no-print * {
        display: none !important; /* don't show when printing */
    }
    .only-print {
      display: inline !important; /* show only when printing */
    }
  }

  body {
    background: #000;
    border: 0px;
    font-family: 'Oxygen', sans-serif;
    margin: auto !important;
    width: 950px;
  }

  h2, h3    { display: inline-block;  }
  h3        { padding-left: 10px;  }
  .centerme { margin: 10px 10px;  }
  #container {  /* whole page */
    max-width: 900px;
    margin: auto;   /*border: 1px solid lightblue;*/
    background: white;
    padding: 10px;
  }

  span.headbox{
    width: 33%;
    height: 120px;
    float: left;
    /*border: 1px solid green; */
  }
  
  span.cImg{float:right;}
  span.topbox{height:70px;}
  
  span.AnswerCell {  /* Equations section */
    background-color: #f2f2f2;  /* gray #f2f2f2*/
    border: 3px solid #9e9e9e; /* border color */
    display: inline-block;
    height: 200px;
    padding: 5px; 
    margin: 2px 2px 20px 2px; 
  }  
  .txtctr      { text-align: center; }
  .EquationBox { border: 1px solid blueviolet; } 

  #ctrlPanel {
    text-align: left;
    background-color: rgb(245, 241, 26); /*yellow*/
    /*border: solid 1px red;/* */
    border-radius: 10px; /*rounded corners*/
    padding: 5px;
    height: 140px;
    /*display: none; */
  }

  table td, table th { padding: 1px 10px; }
  #btnOpen {
    padding: 5px;
    text-align: center;
  } 
  .ghost  { visibility: hidden; } 

  .zbox {
    margin: 10px;    
    /*font-family: Arial, Helvetica, sans-serif;*/
    font-size: 2.5em;
    text-align: right;
    /* border: 1px solid red; /**/
  } 
  .barz {
    border-top: 6px solid #000;
    margin: 10px;
    min-width: 100px;
    /*font-family: Arial, Helvetica, sans-serif;*/
    font-size: 2em;
    text-align: right;
  } 

  /* Slider toggle */
  .switch {
    position: relative;
    display: inline-block;
    width: 68px;
    height: 20px;
  }
  
  .switch input { 
    opacity: 0;
    width: 0;
    height: 0;
  }
  
  .slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #6CE11B;
    -webkit-transition: .4s;
    transition: .4s;
  }

  input:checked + .slider { background-color: 6CE11B; }
  
  .slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 0px;
    background-color: white;
    -webkit-transition: .4s;
    transition: .4s;
  }
  
  input:checked + .slider { background-color: red; }   
  input:focus + .slider   { box-shadow: 0 0 1px #6CE11B; }  
  
  input:checked + .slider:before {
    -webkit-transform: translateX(40px); /* Right side */
    -ms-transform: translateX(40px);
    transform: translateX(40px);
  }
  
  /* Rounded sliders */
  .slider.round { border-radius: 34px; }
  .slider.round:before { border-radius: 50%;  }

  button#btnXOpen {
    width: 35px;
    height: 5px;
    background-color: black;
    margin: 6px 0;
  }