Use this CSS Code for coupon

<style>
body {
    font-family: Arial;
}

.coupon {
    border: 5px dotted red;
    width: 90%;
    border-radius: 15px;
    margin: 0 auto;
    max-width: 90%;
}

.container {
    padding: 2px 16px;
    background-color: #f1f1f1;
}

.promo {
    background: #ccc;
    padding: 3px;
    color: Green;
font-weight: bold;
font-size: 20px;
}

.category{
    background: #ccc;
    padding: 3px;
    color: purple;
font-weight: bold;
font-size: 20px;
}

a:hover {
    background-color: yellow;
}

.expire {
    color: red;
font-weight: bold;
}
</style>

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