body {
    font-family: Arial, sans-serif;
/*    text-align: center;*/
    margin: 30px auto;
    color: #cc0;
    background: darkgreen;
}

header {
      display: flex;
      align-items: center;
      margin: 0 auto;
}
h1 {
    margin-left: auto;
}

#sudoku-board {
    display: grid;
    grid-template-columns: repeat(9, 50px); /*40px);*/
    grid-template-rows: repeat(9, 50px); /*40px);*/
    gap: 1px;
/*    margin: 20px auto;*/
    margin-left: 2px;
    max-width: 470px; /*380px;*/
    max-height: 470px; /*380px;*/
}

input[type=number] {
    width: 40px; /*30px;*/
    height: 40px; /*30px;*/
    text-align: center;
    font-size: 18px;
}
*:disabled {
  background-color: dimgrey;
  color: linen;
  opacity: 1;
}

#generate, #correct{
    margin-top: 20px;
    padding: 10px 10px;
    font-size: 16px;
  border-radius: 1.5rem;
  background: rgba(255,255,255,0.7);
}

#container {
  background-color: rgba(255,255,255,0.9);
  width: 140px; /*540px;*/
  border-radius: 1rem;
  margin: 0 auto;
  padding: 0.5rem; /*1.5rem;*/
}

#time {
  color: #901eff;
  font-size: 1.5rem; /*3rem;*/
  text-align: center;
  padding: 0.2rem; /*1rem;*/
  border-radius: 1rem;
  box-shadow: 0 0 20px rgba(0,253,139,0.25);
  margin: .5rem;
}

#buttons {
  font-size: 0.7rem; /*3rem;*/
  text-align: center;
}

#start, #stop, #reset {
  font-size: 0.7rem; /*1.5rem;*/
  border-radius: .3rem;
  box-shadow: 0 0 10px rgba(77, 78, 79, 0.25);
  height: 1.2rem;
  background: rgba(255,255,255,0.3);
}

      #wrapper {
        position: relative;
        width: 480px;
        margin: 20px auto;
      }
      table {
        border-collapse: collapse;
        border-spacing: 0;
        position: absolute;
/*        position: relative;*/
        width:460px;
        height: 460px;
/*        margin: 5px auto;*/
        margin-left: auto;
        margin-top: -2px;
        z-index: -1;
      }
      td {
        border: 1px solid rgb(250 160 160);
      }