#box_blog .box_title{
    background: url('../png/blog-toan-tu-duy.png') no-repeat left top;
    color: #6c2c8c;
}

#box_tintucgd .box_title{
    background: url('../png/tin-tuc-giao-duc.png') no-repeat left top;
    color: #6c2c8c;
}

#box_tailieuhoctap .box_title{
    background: url('../png/tai-lieu-hoc-tap.png') no-repeat left top;
    color: #6c2c8c;
}

#box_blog .box_title a, #box_tintucgd .box_title a, #box_tailieuhoctap .box_title a {
    color: #6c2c8c;
}