.pages_sf_right_main {
    display: inline-block;
    width:300px;
    height:auto;
}
.pages_sf_right_parent {
    position: relative;
    display: inline-block;
    width:300px;
    height:auto;
    /*border:1px solid green;*/
}
.pages_sf_right_block {
    position:-webkit-sticky;
    position:sticky;
    top:10px;
    display: inline-block;
    width:300px;
    height:auto;
    padding-bottom:3px;
    /*border:1px solid red;*/
}