.math {
    background-color: white;
  }
  h1 {
    margin-bottom: 20px;
    text-align: center;
    font-size:28px !important;
  }
  
  .btn {
    box-shadow: 0px 5px 10px #222222;
    font-size:18px;
  }
  
  .btn:focus {
    outline: none;
  }
  
  .button-row div {
    width: 60px;
    height: 60px;
    text-align: center;
    line-height: 60px;
    margin: 5px;
  }
  
  .button-row .btn {
    width: 60px;
    height: 60px;
    background-color: #e7bba5;
  }
  
  .button-row .btn:hover {
    background-color: #905f59;
    color: white !important;
  }
  
  .button-orange {
    background-color: #eb6a66 !important;
  }
  
  .button-orange:hover {
    background-color: #be5855 !important;
  }
  
  .button-blue {
    background-color: #89c9b9 !important;
  }
  
  .button-blue:hover {
    background-color: #659b8d !important;
  }
  
  .button-off {
    background-color: #c54040 !important;
  }
  
  .calc-history-eq {
    color: #B0B0B0;
    cursor: pointer;
  }
  
  #container {
    width: 600px;
    background-color: #291c1c;
    height: 100%;
    border-radius: 10px;
    margin-top: 8%;
  }
  
  #expression {
    height: 60px;
    margin-bottom: 20px;
    padding: 10px;
    text-align: right;
    background-color: #bb6060;
    border-radius: 5px;
    font-size: 30px;
    box-shadow: 0px 5px 10px #9e1010 inset;
  }
  
  #standard-buttons {
    margin-bottom: 10px;
  }
  
  #advanced-buttons {
    display: inline-block;
    display: none;
    margin-left: -20px;
  }
  
  #toggle-advanced:hover {
    background-color: #858585 !important;
  }
  
  #toggle-advanced span {
    pointer-events: none;
  }
  
  #calc-history {
    float: right;
    width: 200px;
    height: 270px;
    background-color: #636363;
    border-radius: 5px;
    margin-top: 6px;
    padding: 10px;
    box-shadow: 0px 5px 10px #444444 inset;
    overflow:auto;
    font-size:18px;
  }
  
  #calc-history-box {
    font-size:18px;  
  }
  
  #calc-history hr {
    margin-top: 5px;
    margin-bottom: 5px;
  }
  
  #footer {
    background-color: #262626;
    margin-left: -15px;
    margin-right: -15px;
    margin-bottom: -15px;
    margin-top: 15px;
    padding: 10px;
    padding-bottom: 1px;
    color: #636363;
    border-bottom-left-radius: 10px;
    border-bottom-right-radius: 10px;
  }