:root {
  --rows: 25;
  --cols: 51;
}

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  width: 100vw;
  font-family: "Roboto", sans-serif;
}

.inactive {
  pointer-events: none;
}

.btn {
  outline: none;
  font-size: 0.9em;
  padding: 0.7em 0.9em;
  margin: 0 0.7em;
  border-radius: 0.8vmin;
  font-weight: 700;
  color: #e2dbeb;
  border: 2px solid #000;
  box-shadow: 0 0 4px #000;
  cursor: pointer;
}

.btn:hover {
  color: #114d72;
}

.btn:active {
  color: #e2dbeb;
  box-shadow: inset 1px 1px 8px #000;
}

.btn.primary {
  background-color: #007bff;
  border-color: #007bff;
}

.btn.success {
  background-color: #0bc20b;
  border-color: #0bc20b;
}

.btn.inactive {
  background-color: #e80000bf;
  border-color: #e80000bf;
}