.hidden {
  display: none;
}

body.dark {
  background-color: #333333;
  color: white;
}

header {
  text-align: center;
  padding-bottom: 10px;
  border-bottom: 1px solid red;
}

h1 {
  font-size: 45pt;
}

#setup-game {
  display: flex;
  justify-content: center;
}

#setup-game > * {
  margin-bottom: 10px;
  padding-left: 50px;
  padding-right: 50px;
  display: flex;
  align-items: center;
}
  
button {
  justify-self: center;
}

p#timer, 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: 50px;
  margin-top: 5px;
  margin-bottom: 5px;
  text-align: center;
}

#board {
  padding-top: 10px;
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-content: flex-start;
  width: 600px;
  height: 600px;
}

.tile {
  border: 1px solid black;
  height: 60px;
  width: 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;
}

footer {
  background-color: lightgray;
  text-align: center;
}