html {
  background: #18181b;
}
.btn-press {
  transform: scale(0.96);
  box-shadow: 0 2px 8px 0 #00000033;
}
.calculator::-webkit-scrollbar {
  display: none;
}

#display {
  min-height: 3.5rem;
  max-height: 5rem;
  font-size: 2.2rem;
  line-height: 1.2;
  width: 100%;
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
  white-space: nowrap;
  text-align: right;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: 0.75rem 1rem;
  background: #18181b;
  border-radius: 0.75rem;
}
@media (max-width: 640px) {
  #display {
    font-size: 1.3rem;
    min-height: 2.2rem;
    padding: 0.5rem 0.5rem;
  }
}

/* Responsive styles */
@media (max-width: 640px) {
  .calculator {
    padding: 0.5rem !important;
    max-width: 100vw !important;
    border-radius: 0.75rem !important;
  }
  button {
    font-size: 1rem !important;
    padding: 0.5rem 0 !important;
  }
}
@media (max-width: 400px) {
  .calculator {
    padding: 0.25rem !important;
    border-radius: 0.5rem !important;
  }
  #display {
    font-size: 1.2rem !important;
    min-height: 2.2rem !important;
    padding: 0.25rem 0.5rem !important;
  }
  button {
    font-size: 0.85rem !important;
    padding: 0.3rem 0 !important;
  }
}