@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@100;200;300;400;500;600;700&display=swap');

* {
    font-family: 'Poppins', sans-serif;
    margin: 0; padding: 0;
    box-sizing: border-box;
    outline: none; border: none;
    text-decoration: none;
    text-transform: uppercase;
}

.container {
    min-height: 100vh;
    background: #eee;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-flow: column;
    padding-bottom: 60px;
}

.container form {
    background: #fff;
    border-radius: 5px;
    box-shadow: 0 10px 15px rgba(0, 0, 0, .1);
    padding: 20px;
    width: 600px;
    padding-top: 160px;
}

.container form .inputBox {
    margin-top: 20px;
}

.container form .inputBox span {
    display: block;
    color: #999;
    padding-bottom: 5px;
}

.container form .inputBox input,
.container form .inputBox select {
    width: 100%;
    padding: 10px;
    border-radius: 10px;
    border: 1px solid rgba(0, 0, 0, .3);
    color: #444;
}

.container form .flexbox {
    display: flex;
    gap: 15px;
}

.container form .flexbox .inputBox {
    flex: 1 1 150px;
}

.container form .submit-btn {
    width: 100%;
    background: linear-gradient(45deg, blueviolet, deeppink);
    margin-top: 20px;
    padding: 10px;
    font-size: 20px;
    color: #fff;
    border-radius: 10px;
    cursor: pointer;
    transition: .2s linear;
}

.container form .submit-btn:hover {
    letter-spacing: 2px;
    opacity: .8;
}

.container .card-container {
    margin-bottom: -150px;
    position: relative;
    height: 250px;
    width: 400px;
}

.container .card-container .front {
    position: absolute;
    height: 100%;
    width: 100%;
    top: 0; left: 0;
    background: linear-gradient(45deg, blueviolet, deeppink);
    border-radius: 5px;
    backface-visibility: hidden;
    box-shadow: 0 15px 25px rgba(0, 0, 0, .2);
    padding: 20px;
    transform: perspective(1000px) rotateY(0deg);
    transition: transform .4s ease-out;
}

.container .card-container .front .image {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 10px;
}

.container .card-container .front .image img {
    height: 50px;
}

.container .card-container .front .card-number-box {
    padding: 30px 0;
    font-size: 22px;
    color: #fff;
}

.container .card-container .front .flexbox {
    display: flex;
}

.container .card-container .front .flexbox .box:nth-child(1) {
    margin-right: auto;
}

.container .card-container .front .flexbox .box {
    font-size: 15px;
    color: #fff;
}

.container .card-container .back {
    position: absolute;
    top: 0; left: 0;
    height: 100%;
    width: 100%;
    background: linear-gradient(45deg, blueviolet, deeppink);
    border-radius: 5px;
    padding: 20px 0;
    text-align: right;
    backface-visibility: hidden;
    box-shadow: 0 15px 25px rgba(0, 0, 0, .2);
    transform: perspective(1000px) rotateY(180deg);
    transition: transform .4s ease-out;
}

.container .card-container .back .stripe {
    background: #000;
    width: 100%;
    margin: 10px 0;
    height: 50px;
}

.container .card-container .back .box {
    padding: 0 20px;
}

.container .card-container .back .box span {
    color: #fff;
    font-size: 15px;
}

.container .card-container .back .box .cvv-box {
    height: 50px;
    padding: 10px;
    margin-top: 5px;
    color: #333;
    background: #fff;
    border-radius: 5px;
    width: 100%;
}

.container .card-container .back .box img {
    margin-top: 30px;
    height: 30px;
}

/* Media Queries for Responsiveness */
@media (max-width: 768px) {
    .container form {
        width: 90%;
        padding-top: 100px;
    }
    .container .card-container {
        width: 90%;
    }
}

@media (max-width: 480px) {
    .container form {
        width: 100%;
        padding-top: 80px;
    }
    .container .card-container {
        width: 100%;
    }
    .container form .flexbox {
        flex-direction: column;
    }
    .container form .submit-btn {
        font-size: 18px;
    }
}
@media (max-width: 300px) {
    .container form {
        width: 100%;
        padding-top: 60px;
        padding: 10px;
    }
    .container .card-container {
        width: 100%;
        height: 200px;
    }
    .container form .submit-btn {
        font-size: 16px;
    }
    .container .card-container .front .card-number-box {
        font-size: 18px;
    }
    .container .card-container .front .flexbox .box,
    .container .card-container .back .box span {
        font-size: 12px;
    }
}

@media (max-width: 200px) {
    .container form {
        width: 100%;
        padding-top: 40px;
        padding: 5px;
    }
    .container .card-container {
        width: 100%;
        height: 150px;
    }
    .container form .submit-btn {
        font-size: 14px;
        padding: 5px;
    }
    .container .card-container .front .card-number-box {
        font-size: 16px;
    }
    .container .card-container .front .flexbox .box,
    .container .card-container .back .box span {
        font-size: 10px;
    }
}