@import url("https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css");

body {
  padding: 20px;
  background: #f6f6f6;
}
p {
  margin: 0 0 1em 0;
}
#view {
  margin: 0.5em 0 0.25em 0;
  border: 1px solid #ccc;
  background: #fff;
}
.container {
  width: 600px;
}
input[type="number"] {
  text-align: center;
  width: 20px;
}
.form-inline {
  display: flex;
  gap: 0.5rem;
}
.form-inline .spacer {
  flex-grow: 1;
}