.text-center {
	text-align: center;
}
.container {
	width: 170px;
  margin-left: auto;
  margin-right: auto;
  border: 2px solid blue;
  padding: 0.5em;
  background-color: skyblue;
}
input[type="button"] {
	width: 30px;
  height: 30px;
  font-weight: 600;
}
#clear {
	width: 100%;
}
body {


}