qr.css

*{
    margin: 0;
    padding: 0;
    font-family:'Poppins', sans-serif;
    box-sizing: border-box;
    color: #14153f;
}

body{
    background: #e2f1ff;
}

.container{
    width: 400px;
    padding: 25px 35px;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    background: #fff;
    border-radius: 10px;
}

.container p{
    font-weight: 600;
    font-size: 15px;
    margin-bottom: 8px;
}

.container input{
    width: 100%;
    height: 50px;
    border: 1px solid #14153f;
    outline: 0;
    padding: 10px;
    margin: 10px 0 20px;
    border-radius: 5px;
}

.container button{
    width: 100%;
    height: 50px;
    background: #14153f;
    color: #fff;
    border: 0;
    outline: 0;
    box-shadow: 0 5px rgba(0,0,0,0.1);
    cursor: pointer;
    margin: 20px 0;
    font-weight: 500;
    border-radius: 5px;
}

#imgBox{
    width: 200px;
    border-radius: 5px;
    max-height: 0;
    overflow: hidden;
    transition: max-height 1s;
}

#imgBox img{
    width: 100%;
    padding:10px;
}

#imgBox.show-img{
    max-height:300px;
    margin: 10px auto;
    border: 1px solid #14153f;
}