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HTML

            
              div.main
  div.editor
    span  Click grid to toggle squares
    br
    span Select a color scheme:
    input(type='radio' name='color' id='blue' checked=true) 
    label(for='blue') Non-Photo Blue
    input(type='radio' name='color' id='sepia')
    label(for='sepia') Old Scroll
    input(type='radio' name='color' id='monochrome')
    label(for='monochrome') High Contrast
    input(type='radio' name='color' id='monochrome2')
    label(for='monochrome2') Low Ink
    br
    span  Check this box to add text & symbols
    input(type="checkbox" class="editing")
    - var n = 0;
    div.grid
      while n < 1024
        input(id='x'+n type="checkbox" class="tile" checked="false")
        label(for='x'+n++)
          input
  div.symbols
    div 
      b Symbols (Copy & Paste)
    div &nbsp;
    div ✪ ❂ ★ Statue
    div Ⓒ Ⓕ Ⓢ Trap door
    div ● Pillar
    div ⊠ Covered Pit
    div ▣ Open Pit 
    div Τ Trap
    div ◉ Well
    div ◎ Fountain
    div ≋ Water
    div ⌹ Altar
    div 🄲 Chest
    div 🅃 Table
    div ⩌ ⩍ ⫏ ⫐ Chairs
    div ⚰ Sarcophagus
    div ⚗ Alchemy Still
    div ⚔ Weapons
    div ⚒ Tools
    div ⊜ Barrel
    div ⊟ Crate
    div ⢸ ⋯ Bars/Portcullis
    div ⌇ 〰 Curtain/Tapestry
    div ⊞ Grate
    div ⬚ Skylight
    div ⊥ Lever
    div ⎈ Wheel
    div ← ↑ → ↓ ↖ ↗ ↘ ↙ Arrows
    div ⇠ ⇡ ⇢ ⇣ Dotted Arrows
    div ↜ ↝ ⇜ ⇝ Wavy Arrows
!

CSS

            
              body {
  font-family: 'Apple Symbols', sans-serif;
}
.main {
  min-height: 900px;
  max-width: 1000px;
  margin: auto;
}
.editor {
  width: 800px;
  margin: auto;
  float: left;
}
.grid {
  margin: 10px auto;
  display: flex;
  flex-wrap: wrap;
  width: 800px;
}
input.tile[type=checkbox] {
  display: none;
}
input.tile[type=checkbox] + label {
  box-sizing: border-box;
  display: block;
  border: 0;
  padding: 0;
  display: block;
  width: 25px;
  min-width: 25px;
  height: 25px;
}
label > input {
  box-sizing: border-box;
  background: red;
  border: 0;
  padding: 3px 0 0 0;
  background: none;
  text-align: center;
  font-size: 19px;
  font-family: 'Apple Symbols', sans-serif;
  width: 100%;
  height: 23px;
  line-height: 23px;
  pointer-events: none;
}
.editing:checked + .grid label > input {
  pointer-events: auto;
}
.symbols {
  float: right;
}

/* colors */
#sepia:checked ~ .grid {
  box-shadow: 0 0 10px rgba(0,0,0,0.5), inset 0 0 100px 15px rgba(50,50,0,0.3);
  padding: 5px;
  background: -webkit-linear-gradient(top, rgba(217,181,121, 1), rgba(218,188,134, 1) 100%);
}
#sepia:checked ~ .grid input.tile[type=checkbox] + label {
  border: 1px solid rgba(93,78,45, 0.7);
}
#sepia:checked ~ .grid input.tile[type=checkbox]:checked + label {
    background-image: linear-gradient(
    45deg, 
    transparent 33%, 
    rgba(93,78,45, 0.7) 33%, 
    rgba(93,78,45, 0.7) 66%, 
    transparent 66%
    );
  background-size: 3px 3px;
}
#sepia:checked ~ .grid input.tile[type=checkbox]:not(:checked) + label {
  bbackground-color: rgba(235,221,195, 0.90);
}
#sepia:checked ~ .grid label > input {
  color: rgba(73,50,16, 0.8);
}

#blue:checked ~ .grid,
#blue:checked ~ .grid input.tile[type=checkbox] + label {
  border: 1px solid #99d0e1;
}
#blue:checked ~ .grid input.tile[type=checkbox]:checked + label {
  background-color: #a4dded;
}
#blue:checked ~ .grid input.tile[type=checkbox]:not(:checked) + label {
  background-color: #ffffff;  
}
#blue:checked ~ .grid label > input {
  color: #99d0e1;
}

#monochrome:checked ~ .grid,
#monochrome:checked ~ .grid input.tile[type=checkbox] + label {
  border: 1px solid #000;
}
#monochrome:checked ~ .grid input.tile[type=checkbox]:checked + label {
  background-color: #000;
}
#monochrome:checked ~ .grid input.tile[type=checkbox]:not(:checked) + label {
  background-color: #ffffff;  
}
#monochrome:checked ~ .grid label > input {
  color: #000;
}

#monochrome2:checked ~ .grid {
  border: 1px solid #000;
  background-image: linear-gradient(
    -45deg, 
    transparent 50%, 
    #888 50%, 
    #888 60%, 
    transparent 60%
    ), linear-gradient(
    45deg, 
    transparent 50%, 
    #888 50%, 
    #888 60%, 
    transparent 60%
    );
  background-size: 10px 10px;
}
#monochrome2:checked ~ .grid input.tile[type=checkbox] + label {
}
#monochrome2:checked ~ .grid input.tile[type=checkbox]:checked + label {
  border: 1px solid transparent;
  background: transparent;
}
#monochrome2:checked ~ .grid input.tile[type=checkbox]:not(:checked) + label {
  border: 1px solid #000;
  background-color: #ffffff;  
}
#monochrome2:checked ~ .grid label > input {
  color: #000;
}
!

JS
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