body {
    background-color: aliceblue;
    padding: 100px;
    background-image: url('https://picsum.photos/seed/picsum/1920/1200');
    background-size: cover;
    background-repeat: no-repeat;
}

.hidden {
    display: none;
}

.show {
    display: block;
}
.jumbotron {
    background-color: rgba(255, 255, 255, 0.5);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 0 10px rgba(0, 0, 0, 0.5);    
}

.btn{
    margin: 20px;
    padding: 10px 20px;
}