index.css

#board {
  margin-left: auto;
  margin-right: auto;
  width: 0;
  height: 0;
  border-left: 340px solid transparent;
  border-right: 340px solid transparent;
  border-bottom: 510px solid LightGray;
}

.wrapper {
  display: grid;
  grid-auto-rows: 85px;
  margin-top: 30px;
  background-color: green;
  position: relative;
  left: -305px;
}

.row1a {
  display: flex;
  left: 440px;
  line-height: 25px;
}

.row {
  display: flex;
  margin: 0 auto;
  line-height: 50px;
}

@keyframes badSelection {
  50% { 
    border-color: red;
    color: red;
    transform: translateY(2px);
  }
}

.circle {
  margin-left: 60px;
  height: 50px;
  width: 50px;
  border-radius: 50px;
  text-align: center;
  background-color: grey;
  transition: all 0.2s;
  border: 1px solid black;
  box-sizing: border-box;
}

.circle.badSelection {
  animation: badSelection .2s 3;
}

.circle:hover {
  color: white;
  opacity: .75;
  cursor: pointer;
  border: 1px solid white;
}

.circle.selected {
  color: white;
  border: 1px solid white;
}

.circle:empty {
  background-color: white
}

#reset {
  display: block;
  border-radius: 1rem;
  border: 1px solid darkgray;
  cursor: pointer;
  margin: 2rem auto;
  box-sizing: border-box;
  padding: 1rem 2rem;
  transition: all 0.2s;
}

#reset:hover {
  opacity: 0.75;
}

#reset.hidden {
  visibility: hidden;
}

#debug {
  position: absolute;
  bottom: 0;
}