styles.css

body {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  height: 100vh;
  margin: 0;
  background-color: rgba(250, 235, 215, 0.5);
  caret-color: transparent;
}
.calculator {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  flex-direction: column;
  background-color: black;
  opacity: 80%;
  width: 500px;
  min-height: 650px;
  border-radius: 25px;
}

.display {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-direction: row;
  font-size: 80px;
  gap: 0;
  padding-right: 10px;
  font-family: sans-serif;
  background-color: lightgray;
  color: black;
  border-radius: 10px;
  width: 450px;
  height: 120px;
  margin: 30px;
}

.container {
  display: flex;
  flex-wrap: wrap;
  width: 450px;
  height: 450px;
}

.btn {
  display: flex;
  align-items: center;
  justify-content: center;
  color: black;
  margin: 5px;
  width: 100px;
  height: auto;
  border-radius: 5px;
  font-size: 48px;
  font-family: sans-serif;
  cursor: default;
}