:root {
  --red-color: #ce0000;
  --border-color:#dddddd;
}


/*CÁC KHỐI CHÍNH*/
.khungchinh {
    width: 100%;
}

.khoi {
    border: 1px solid;
    position: relative;
    min-height: 100px;
    padding: 40px 15px 30px;
}

.khoi-2 {
    min-height: 100px;
}

.khoi.khoi-giua {
    display: flex;
    padding: 0;
}

.khoi-4, .khoi-6 {
    width: 15%;
}

.khoi-5 {
    flex-grow: 1;
}

 /* module*/
div.module {
    font-size: 15px;
    padding: 5px 25px;
    position: fixed;
    top: 0;
    right: 0;
	z-index: 1000;
   /* border: 1px solid #dddddd;*/
}

div.module:hover {
    color:var(--red-color);
}


/*css cho phàn BOX*/
.box {
    width: 100%;
    margin: 0 0 0px;
    border: 1px dashed  #ccc;
    position: relative;
    min-height: 30px;
    padding: 5px 10px;

}

.box_u {
    width: 100%;
/*    margin: 0 0 30px; */
    /*border: 1px solid #077dd4;*/
    position: relative;
    min-height: 30px;


}

.box:last-child {
    margin: 0;
}

/*nut tuy chon*/
.box .tuychon {
    display: inline-block;
    position: absolute;
    left: -1px;
    top: -24px;
}

.box  div.btn-tuychon {
    padding: 3px 10px;
    font-size: 13px;
    border: 1px solid var(--border-color);
}

.box  div.btn-tuychon:hover, .box .chucnang a:hover {
    color: var(--red-color);
}