.background {
    display: block;
    width: 600px;
    max-width: 100%;
    margin: 20px auto;
}

.container {
    width: 600px;
    max-width: 100%;
    margin: 0 auto 30px auto;
    display: grid;
    place-items: center;
    background-color: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Segoe UI', Verdana, sans-serif;
    background-color: #f5f5f5;
    margin: 0;
    padding: 20px 0;
    line-height: 1.4;
}

table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 10px;
}

th, td{
  padding: 10px;
  text-align: center;
  border-bottom: 1px solid #ddd;
}

th{
  background-color: #f0f0f0;
}

input[type="number"], input[type="text"], select{
  padding: 6px;
  border: 1px solid #aaa;
  border-radius: 6px;
}

h3{
  margin-top: 20px;
}

#validPromo{
  font-weight: bold;
  margin-left: 8px;
}

#shipImg{
  width: 150px;
  height: auto;
  margin: 10px 0;
}

.Btn {
    font-size: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: 0.3s;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    padding: 5px 10px;
}

.Btn:hover {
    background-color: #0088ff;
}

.Btn:active {
    transform: scale(0.75);
}