body {
  font-family: Avenir, Helvetica, sans-serif;
  overflow-x: hidden;
}

.sudoku li:nth-child(n):nth-child(-n + 9) {
  border-top-width: 4px;
}

.sudoku li:nth-child(n + 73):nth-child(-n + 81) {
  border-bottom-width: 4px;
}

.sudoku li:nth-child(3n) {
  border-right-width: 4px;
}

.sudoku li:nth-child(9n + 1) {
  border-left-width: 4px;
}

.sudoku li:nth-child(n + 19):nth-child(-n + 27) {
  border-bottom-width: 4px;
}

.sudoku li:nth-child(n + 46):nth-child(-n + 54) {
  border-bottom-width: 4px;
}

ul.sudoku {
  display: grid;
  grid-template-columns: repeat(9, 5vw);
  grid-template-rows: repeat(9, 5vw);
  justify-content: center;
  align-content: center;
  grid-gap: 0rem;
  list-style: none;
  margin: 0 0 2vw;
  padding: 0;
  font-size: calc(2vw + 10px);
}

.sudoku li {
  margin: 0;
  padding: 0;
  text-align: center;
  border: 1px solid rgb(233, 230, 230);
  display: flex;
  align-items: center;
  justify-content: center;
}

.sudoku li span {
  margin-top: 0.4rem;
}

.note {
  background: #ddd;
  font-family: monospace;
  padding: 2em 5em;
  font-size: 120%;
  order: -1;
}

@supports (display: grid) {
  .note {
    display: none;
  }
}

.form-control {
  width: 100%;
  height: 100%;
  border: none;
  border-radius: 0;
  background: transparent;
  text-align: center;
  font-size: 10px;
  outline: none;
  font-family: monospace;
  font-weight: bold;
  font-size: calc(1vw + 10px);
  transition: all 0.2s ease-in-out;
}

.form-control:hover {
  background-color: rgb(84, 84, 84);
}
.generateSudoku {
  /* margin: 0 0 2vw;
  padding: 1vw 2vw; */
  font-size: 1.5vw;
  width: 100%;
  transition: all 0.3s ease-in-out;
}
.input-group {

  margin: 10px 0 2vw;
  font-size: 1.5vw;
  width: 100%;
  transition: all 0.3s ease-in-out;
}