nav {
  background-color: rgb(255, 199, 199);
}
.navbar-brand {
  color: white;
}

body {
  font-family: "ヒラギノ角ゴ ProN W3", メイリオ, Arial, sans-serif;
}

.write_mode {
  text-align: right;
}

input {
  float: left;
}

.kadomaru {
  border-radius: 15px;
}

.relative {
  width: 100%;
  height: auto;
  position: relative;
}

.num_result {
  position: absolute;
  top: 10px;
  left: 5%;
  bottom: 80px;
  color: red;
  padding: 10px 0;
  font-size: 18px;
  font-weight: bold;
  float: left;
}

.letter {
  position: absolute;
  top: 10px;
  left: 85%;
  bottom: 90px;
  color: red;
  padding: 10px 0;
  font-size: 18px;
  font-weight: bold;
  text-align: right;
}

#num_result {
  font-size: 40px;
}

#letter {
  font-size: 40px;
}


#mode {
  font-size: 36px;
}