.hidden {
  display: none;
}
body.dark {
  background-color: rgb(45, 100, 117);
  color: white;
}
.header {
  text-align: center;
  padding-bottom: 20px;
  padding-top: 10px;
  border-bottom: 1px solid green;
}
#A {
  font-size: 40px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}
#B {
  font-size: 27px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}

#label {
  font-size: 23px;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
}
#start {
  background: #ecf4ff;

  border-radius: 50em;
  color: green;
  margin-top: 2em;
  top: 30em;
  width: 17%;
  height: 3em;
  text-align: center;
  z-index: 6;
}
#setup-game {
  display: flex;
  justify-content: center;
}
#setup-game > * {
  margin-bottom: 7px;
  padding-left: 20px;
  padding-right: 20px;
}
p#timer {
  font-size: 25px;
  font-weight: bold;
  text-align: center;
}
p#lives {
  font-size: 25px;
  font-weight: bold;
  text-align: center;
}
#game {
  display: flex;
  justify-content: center;
}
#number-container > p {
  border: 1px solid black;
  border-radius: 20%;
  width: 60px;
  height: 60px;
  font-size: 40pt;
  margin-left: 1200px;
  margin-top: 5px;
  margin-bottom: 5px;
}
#board {
  padding-top: 10px;
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-content: flex-start;
  margin: 0 315px 500px;
  width: 600px;
  height: 100px;
  float: left;
}
.tile {
  border: 1px solid black;
  width: 60px;
  height: 60px;
  text-align: center;
  margin: 0px;
  vertical-align: middle;
  font-size: 40pt;
}
p.selected {
  background-color: lightblue;
}
p.incorrect {
  color: red;
}
.rightborder {
  border-right: 4px solid black;
}
.bottomborder {
  border-bottom: 4px solid black;
}
