div.right {
position: sticky;
top: 300px;
height: 300px;
background-color:#fff;
box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19);
}
#block-4 {
display: none;
}
#block-15 {
display: none;
}
#block-16 {
display: none;
}
#block-17 {
display: none;
}