*{
  box-sizing: border-box;
}

body{
  margin: 0;
  padding: 0;
  background: #14131a;
  color: #f2f2f2;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
               "Liberation Mono", "Courier New", monospace;
}

h1{
  text-align: center;
  margin: 24px 0 12px;
  letter-spacing: 2px;
  text-transform: uppercase;
  font-size: 20px;
}

.big-container{
  display: flex;
  justify-content: center;
  gap: 32px;
  padding: 16px 24px 32px;
}

.buttons-container{
  width: 320px;
  padding: 18px;
  background: linear-gradient(180deg, #1f1d2b, #2a2840);
  border: 3px solid #000;
  box-shadow: 6px 6px 0 #000;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.buttons-container label{
  font-size: 12px;
  letter-spacing: 1px;
  text-transform: uppercase;
  opacity: 0.9;
}

.grid-range-container{
  padding: 10px;
  border: 2px solid #000;
  background: rgba(0,0,0,0.15);
}

#grid-value{
  color: #7CFFB2;
}

input[type="color"]{
  width: 100%;
  height: 44px;
  padding: 0;
  border: 2px solid #000;
  background: rgba(0,0,0,0.15);
}

input[type="range"]{
  width: 100%;
}

button{
  width: 100%;
  padding: 10px 12px;
  background: #2d2a3f;
  color: #f2f2f2;
  border: 3px solid #000;
  box-shadow: 4px 4px 0 #000;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
}

button:active{
  box-shadow: 1px 1px 0 #000;
  transform: translate(3px, 3px);
}

.grid-container{
  width: 602px;
  height: 602px;
  background: #0f2a1b;
  border: 1px solid #000;
  box-shadow: 6px 6px 0 #000;
  display: flex;
  flex-wrap: wrap;
}

.square{
  background: transparent;
  border: 1px solid rgba(148, 250, 190, 0.12);
}