body {
background-image: url(https://media.istockphoto.com/photos/full-jack-olantern-trick-or-treat-bucket-with-face-mask-halloween-picture-id1277048731?b=1&k=20&m=1277048731&s=170667a&w=0&h=YM0vXh4nZRvcqiREsj7BJRSf8IJWe2Opx4iSeQIj4RM=);
}

.text-center {
	text-align: center;
}
.container {
	width: 200px;
  margin-left: auto;
  margin-right: auto;
  border: 2px solid black;
  padding: 0.5em;
  background-color: lightblue;
  border-radius: 20px;
} 

#output {
  width: 95%;
  height: 50px;
  font-size: 2rem;
  background-color: #ADC6FF;
  border-radius: 12px;
}


input[type="button"] {
	width: 30px;
  height: 30px;
  font-weight: 600;
  background-color: snow;
  
}
#clear {
	width: 100%;
}