@import url('https://fonts.googleapis.com/css2?family=Montserrat&display=swap');

html {
  height: 100%;
  width: 100%;
}

body {
  font-family: 'Montserrat', sans-serif;
  background-color: #f5f4f0;
}

p {
  text-align: center;
}
#nbackDisplay {
  margin: auto;
  text-align: center;
  max-width: 150px;
  border-radius: 6px;
  font-weight: 800;
  font-size: 24px;
  min-height: 60px;
  background-color: #dbdbdb;
  line-height: 60px;
}
#number {
  opacity: 1;
  transition: 850ms opacity;
  text-align: center;
  font-size: 128px;
  font-weight: 700;
  min-height: 150px;
  line-height: 150px;
}
#correct {
  text-align: center;
  font-weight: bold;
  font-size: 32px;
  min-height: 60px;
  line-height: 60px;
}
#startArea {
  text-align: center;
  font-size: 32px;
  min-height: 80px;
  line-height: 80px;
}
#nback {
  text-align: center;
  font-weight: 500;
  font-size: 24px;
  min-height: 80px;
  line-height: 80px;
}
#score {
  text-align: center;
  font-weight: 300;
  font-size: 24px;
  min-height: 60px;
  line-height: 30px;
}

.keypad {
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  align-items: center;
}

.row {
  display: flex;
  flex-direction: row;
  justify-content: space-around;
  align-items: center;
  margin: 1px;
}


.key {
  width: 60px;
  height: 60px;
  border-radius: 6px;
  background-color: #505050;
  color: #fff;
  text-align: center;
  font-family: 'Montserrat', sans-serif;
  font-weight: 700;
  font-size: 32px;
  margin: 1px;
}

.start {
  width: 180px;
  height: 60px;
  border-radius: 6px;
  background-color: #1d26a5;
  color: #fff;
  text-align: center;
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  font-size: 32px;
  margin: 1px;
}

.setn {
  width: 40px;
  height: 40px;
  border-radius: 6px;
  background-color: #8e89a9;
  color: #fff;
  text-align: center;
  font-family: 'Montserrat', sans-serif;
  font-weight: 600;
  font-size: 24px;
  margin: 1px;
}