<style>
#mainContent {
width: 100%;
height: 100%;
position: fixed;
top: 0;
left: 0;
overflow-y: auto;
background-color: white;
}
#post_detail,
#comment_nav,
#commentform_title,
#tip_comment,
#sideBarMain {
display: none;
}
.comment_textarea{
width: 100%;
position:fixed;
bottom:0;
left:0;
}
</style>
