* {
    padding: 10;
    margin: 10;
}
body {
    background-color: #221b4f;
}
.container {
    width: 275px;
    background-color: #fff;
    padding: 10px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 10px;
}
.container p {
    font-weight: 600;
    font-size: 18px;
    margin-bottom: 8px;
}
.container textarea {
    height: 30px;
    width: 92%;
    border-radius: 8px;
    padding: 9px;
    margin-bottom: 8px;
    border-width: 2px;
}
.container button {
    height: 50px;
    width: 100%;
    color: #fff;
    font-weight: 600;
    font-size: 20px;
    border: none;
    cursor: pointer;
    background-color: #6338db;
    border-radius: 8px;
}
#qrBox {
    width: 200px;
    max-height: 0;
    overflow: hidden;
    margin: 0 auto 8px;
    transition: max-height 1s ease-in-out;
}
#qrBox img {
    width: 100%;
}
#qrBox.qr_show {
    max-height: 300px;
    border: 2px solid #000;
    padding: 5px;
    border-radius: 8px;
}
.blank_input {
    animation: shake 0.1s linear 10;
}
@keyframes shake {
    0% {
        transform: translateX(0);
    }
    25% {
        transform: translateX(2px);
    }
    50% {
        transform: translateX(0);
    }
    75% {
        transform: translateX(-2px);
    }
    100% {
        transform: translateX(0);
    }
}

@media only screen and (min-width: 720px) {
    .container {
        width: 500px;
        padding: 20px;
    }

    .container p {
        font-size: 30px;
        margin-bottom: 20px;
    }

    .container textarea {
        height: 30px;
        width: 96%;
        margin-bottom: 20px;
    }

    .container button {
        font-size: 24px;
    }

    #qrBox {
        width: 300px;
    }

    #qrBox.qr_show {
        max-height: 400px;
        border: 3px solid #000;
        margin-bottom: 20px;
    }
}