style.css

body {
  margin: 0;
  font-family: 'Lucida', sans-serif;
}

div#game_board {
  display: -ms-grid;
  display: grid;
  max-width: 1800px;
  -ms-grid-columns: (minmax(600px, 1fr))[auto-fit];
      grid-template-columns: repeat(auto-fit, minmax(600px, 1fr));
  justify-items: center;
  grid-gap: 0;
}

@media (min-width: 1200px) {
  div#game_board canvas#game {
    -ms-grid-row: 1;
    -ms-grid-row-span: 2;
    grid-row: 1/3;
  }
}

div.control_board {
  padding: 0.5em;
  -ms-grid-column: 1;
  -ms-grid-column-span: 2;
  grid-column: 1/3;
  -ms-grid-column-align: stretch;
      justify-self: stretch;
  display: -ms-grid;
  display: grid;
  grid-column-gap: 1em;
  grid-row-gap: 5px;
  font-size: 0.8rem;
  -ms-grid-columns: (150px)[7];
      grid-template-columns: repeat(7, 150px);
  -ms-grid-rows: 50px;
      grid-template-rows: 50px;
}

@media (min-width: 1800px) {
  div.control_board {
    -ms-grid-column: 2;
    grid-column: 2;
    -ms-grid-row: 2;
    grid-row: 2;
  }
}

div.control_board div.input_legend {
  display: inline-block;
  text-align: center;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  background-image: radial-gradient(#c47777af, rgba(145, 152, 229, 0.589));
}

div.control_board div.input_legend input[type=range].custom-slider {
  padding: 10%;
  border: 1px solid lightgray;
  width: 80%;
  height: 20%;
}

div.control_board input#dialog_file {
  display: none;
}

div.control_board input[type=number] {
  width: 8ch;
}

div.control_board button {
  background-color: lightgrey;
}

div.control_board button.btn_enabled {
  background-color: #a3a3a3;
}

div.control_board button:hover {
  background-color: rgba(44, 44, 136, 0.4);
}
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