body {
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  background-color: hsl(30deg 0% 84%);
  background-image:url('../img/sakura-tree.jpg');
  background-repeat: no-repeat;
  background-position: center top;
}

#calculator {
  font-family: Arial, Helvetica, sans-serif;
  background-color: hsl(6deg 55% 84%);
  border-radius: 15px;
  max-width: 500px;
  /* height: 700px; */
  overflow: hidden;
}

#display {
  width: 92%;
  padding: 20px 50px 20px 0;
  font-size: 5rem;
  text-align: right;
  border: none;
  background-color: hsl(6deg 55% 80%);
  color: white;
}

#keys {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
  padding: 25px;
}

#keys h1{
  grid-column: 2 / 5 ;
  color: blanchedalmond;
  text-align: right;
  padding: 20px 20px 0 0;
  font-weight: 400;
  font-family: 'Zeyada',"Slackside One", "Zen Kurenaido", sans-serif;
  /* font-family: 'Kristi', 'CalligraphyBrushJP', 'Noto Serif JP'; */
  /* font-family: mfnv-n4, adobe-notdef; */
}

button {
  width: 100px;
  height: 100px;
  border-radius: 50px;
  border: none;
  background-color: hsl(0, 0%, 20%);
  color: white;
  font-size: 3rem;
  font-weight: bold;
  cursor: cell;
}

button:hover {
  background-color: hsl(0, 0%, 40%);
}

button:active {
  background-color: hsl(0, 0%, 70%);
}

.operator-btn {
  background-color: hsl(35, 100%, 65%);
}

.c {
  font-size: 1.5rem;
  /* writing-mode: vertical-rl;
  text-orientation: use-glyph-orientation; */
}

.maru{
  padding-top: 5%;
}

.operator-btn:hover {
  background-color: hsl(35, 100%, 80%);
}

.operator-btn:active {
  background-color: hsl(35, 100%, 90%);
}