.input-prepend.input-append input {
  font-size: 24px;
  padding-top: 11px;
  padding-bottom: 11px;
  width: 100px;
  text-align: right;
}
.btn-addcart {
  width: 300px;
 height: 50px;
}
@media screen and (max-width: 330px) {
  .btn-addcart {
  width: 80%;
}
}
.num-up-btn , .num-dw-btn {
 padding: 15px; 
}