body {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    background-color: #f8f9fa;
    margin: 0;
    font-family: Arial, sans-serif;
}

.card {
    width: 350px;
    height: 220px;
    border-radius: 15px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    background: linear-gradient(145deg, #fdfbfb, #ebedee);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 15px;
}

.card-header {
    display: flex;
    align-items: center;
}

.shell-logo {
    width: 50px;
    height: auto;
    margin-right: 10px;
}

.card-header h1 {
    font-size: 1.5em;
    color: #d81f26;
    margin: 0;
}

.card-body {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.card-number {
    font-size: 1.2em;
    font-weight: bold;
    margin-bottom: 10px;
}

.card-holder {
    font-size: 1em;
    margin-bottom: 5px;
}

.valid-thru {
    font-size: 0.9em;
    color: #555;
}

.card-footer {
    display: flex;
    justify-content: center;
    align-items: center;
}

.qr-code {
    width: 60px;
    height: 60px;
}