#banner-trai, #banner-phai {
    width: 200px;
    height: 440px;
    position: fixed;
    top: calc(50% + 35px);
    transform: translate(0,-50%);
    -webkit-transform: translate(0,-50%);
    -o-transform: translate(0,-50%);
    -moz-transform: translate(0,-50%);
}

#banner-trai{
    left:0;
    /*background-color:red;*/
}
#banner-phai{
    right: 0;
    /*background-color:blue;*/
}
.slider-quangcao img{
    width:100%;
}