[Code] Đóng Khung bài viết bằng con dấu

    <style>
    #triangles{
    margin:6em;
    width:0; /*set dimensions of DIV to 0 so its borders collapse and touch one
    another*/
    height:0;
    border-color: red blue green yellow; /*top, right, bottom, and left border*/
    border-style: solid;
    border-width: 50px; /*width of each border*/
    }
    .uparrowdiv, .downarrowdiv, .leftarrowdiv, .rightarrowdiv{
    width:95%;
    min-height:100%;
    background: #ffffff;
    background-image: url(http://i16.servimg.com/u/f16/17/97/23/90/mhp10.png);
      background-position: top right;
            background-repeat: no-repeat;
    border:2px solid #3dbbff;
                -moz-border-radius:8px;
                box-shadow: 0 0 1em #b6b6b6;
                -webkit-border-radius:8px;
                position: relative;
    }

    .uparrowdiv:after{
    content:'';
    display:block;
    position:absolute;
    top:-20px;
    left:30px;
    width:0;
    height:0;
    border-color: transparent transparent #3dbbff transparent;
    border-style: solid;
    border-width: 10px;
    }

    {postrow.displayed.MESSAGE}

    <div class="uparrowdiv" style="padding: 10px;">
     {postrow.displayed.MESSAGE}
    </div>