body {
  font-family: Arial, sans-serif;
  background: #FFFFFF;
  color: #404040;
  margin: 0;
  padding: 20px;
}

.container {
  max-width: 800px;
  margin: auto;
}

/* NUOVO BOX LOGO E TITOLI */
.header-box {
  background: rgba(229,229,229,0.6);
  border: 1px solid #000000;
  border-radius: 6px;
  padding: 15px;
  width: 500px;
  margin: 0 auto 15px auto;
  text-align: center;
}

h3, h4 {
  text-align: center;
  margin-top: 10px;
  margin-bottom: 10px;
}

.box {
  padding: 20px;
  margin: 10px auto;
  border-radius: 6px;
  width: 500px;
  box-sizing: border-box;
}

.box-prodotto {
  background: rgba(219, 84, 90, 0.15);
}

.box-coupon {
  background: rgba(219, 84, 90, 0.15);
}

.box-spedizione {
  background: rgba(219, 84, 90, 0.15);
}

.box-riepilogo {
  background: rgba(71, 138, 201, 0.15);
}

input, select {
  width: 100%;
  padding: 12px;
  margin: 8px 0;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 15px;
  display: block;
  text-align: left;
  box-sizing: border-box;
}

label {
  font-size: 14px;
  display: block;
  margin-top: 10px;
  margin-bottom: 4px;
}

.buttons {
  width: 500px;
  margin: 10px auto;
  box-sizing: border-box;
}

.btn {
  display: block;
  width: 100%;
  background: #DB545A;
  color: white;
  padding: 14px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 16px;
  margin-top: 10px;
  text-align: center;
}

.btn:hover {
  opacity: 0.9;
}

.total {
  border-radius: 6px;
  padding: 15px;
  width: 500px;
  margin: 10px auto;
  box-sizing: border-box;
  text-align: left;
}

.promo {
  background: #fceaea;
  border: 1px solid #DB545A;
  padding: 12px;
  border-radius: 6px;
  width: 500px;
  margin: 10px auto;
  box-sizing: border-box;
  text-align: left;
}

.error {
  color: red;
  font-weight: bold;
  margin-top: 10px;
  text-align: center;
}

@media (max-width: 520px) {

  .box,
  .promo,
  .total,
  .buttons,
  .header-box {
    width: 100%;
  }

}