@import url('https://fonts.cdnfonts.com/css/seven-segment');
#Calculator{
  border-radius: 20px;
  background-color:#3A2E2E;
  padding: 20px;
  margin: 20px;
  max-width:600px;
  border: 10px solid #2B2222;
}
#display{
  border: 10px solid #2B2222;
  border-radius: 50px;
  padding: 0 30px;
  margin:20px;
  font-size:5em;
  text-align:right;
  font-family: 'Seven Segment', sans-serif;
  background-color:#A8C64E;
}
.btn.btn-primary,.btn.btn-danger {
  font-size:2.5em;
}
.btn-primary {
  background-image: linear-gradient(to bottom,#337ab7 0,#265a88 100%);
  border-color: #245580;
}

.btn-danger {
  background-image: linear-gradient(to bottom,#d98380 0,#c12e2a 100%);
  border-color: #b92c28;
}

li{color:#fff}