* {
  -webkit-tap-highlight-color: transparent;
}
body{
  margin: 20px;
  font-family: monospace;
  color: black;
}
h2{
  text-align: center;
  font-size: 34px;
}
div.arena{
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

.arena input[type="button"] {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 50px;
  width: 50px;
  font-size: 30px;
  background: rgb(214, 214, 214);
  border: 0;
}
.arena .row:not(:last-child){
  margin-bottom: 5px;
}
.arena .row input[type="button"]:not(:last-child) {
  margin-right: 5px;
}
.arena input[type="button"].used {
  background: black;
  color: white;
}

input.card{
  width: 100px;
  height: 100px;
  margin: 5px;
  border: none;
  background: rgb(45, 19, 78);
}
div.display-board{
  font-size: 3em;
  position: fixed;
  background: rgb(173, 173, 173);;
  top: 263.10px;
  right: 40px;
  padding: 30px;
  width: 300px;
  height: 300px;
  box-shadow: 0px 0px 20px rgb(27, 27, 27);
}


.card-body {
  padding: 10px;
}

.mt-4 {
  margin-top: 10px;
}

.row {
  display: flex;
}

.col-12 {
  width: 100%;
}