.input-prepend.input-append input {
  font-size: 24px;
  padding-top: 11px;
  padding-bottom: 11px;
  width: 100px;
  text-align: right;
}
.icon-lg-b.icon-minus {
    background-position: -288px -120px;
}
.icon-lg-b.icon-plus {
    background-position: -312px -120px;
}