body {
 
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  font-family: "Segoe UI", sans-serif;
}

.calculator {
  width: 300px;
  background: white;
  border: 1px solid #444;
  padding: 11px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.15);
}

/* DISPLAY */
.display {
  height: px;
  background: #2f4f6f;
  color: white;
  text-align: right;
  font-size: 22px;
  padding: 12px;
  border-radius: 10px;
  margin-bottom: 10px;
  border: 1px solid #6fa3d9;
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.4);
}

/* GRID */
.grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  padding: 5px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.15);
}

/* BUTTON */
button {
  height: 32px;   /* 🔽 smaller buttons */
  background: #cfd6dd;
  border: 1px solid #9aa5af;
  font-weight: bold;
  font-size: 13px;  /* 🔽 smaller text */
  cursor: pointer;
}
/* hover */
button:hover {
  background: linear-gradient(to bottom, #f0f7ff, #d6e9fb);
}

/* press */
button:active {
  transform: scale(0.96);
  box-shadow:
    inset 0 3px 5px rgba(0,0,0,0.4);
}