css problem

Hello, i have used the bellow css for the left-sidebar to become sticky in the sider template that i am using but i doesnt seem to work... i tried finding any parent elements with overflow attribute but didnt find any...

.site-content {
        display: flex;
	overflow: none!important;
    }
.inside-left-sidebar, .inside-right-sidebar {
        height: 100%;
    }
.inside-left-sidebar {
  position: -webkit-sticky;
        position: sticky;
        top: 10px;
}

can you tell me why?
http://thefinterestcom.kinsta.cloud/uncategorized/cinamon-spice/