.text-center {
	text-align: center;
}

.container {
	width: 170px;  
  margin-left: auto;
  margin-right: auto;
  border: 2px solid black;
  padding: 0.5em;
  background-color: lightgrey;
  border-radius: 0px 0px 12px 12px;
} 

#outPut {
  border-radius: 12px;
}

input[type="button"] {
	width: 30px;
  height: 30px;
  font-weight: 600;
  background-color: white;
}

input[type="text"] {
  width: 160px; 
  height: 30px;   
  font-size: 26px; 
}

#clear {
	width: 100%;
}