.border_left{
    border-left: 1px solid #fff;
}
#footer{
    /*background: #e3e4e5;*/
}


#bat_tat_nhac:hover{
    opacity: 1;
    cursor: pointer;
}
.tat_nhac{
    background: url("../img/tat-nhac.png") no-repeat center center;
    background-size: 100%;

}

.bat_nhac{
    background: url("../img/mo-nhac.png") no-repeat center center;
    background-size: 100%;
}


/*COMPUTER*/
@media all and (min-width: 599px){
    #footer{
        width: 100%;
        height: 200px;

        margin-top: 3px;


    }
    .tac_gia{
        padding-top: 40px;
    }
    .tac_gia img{
        width: 280px;
        margin-left: 50px
    }

    #bat_tat_nhac{
        position: fixed;
        top: 150px;
        left:10px;
        height: 40px;
        width: 40px;
        opacity: 0.5;
        z-index: 9999;
    }
}





/*MOBILE*/
@media all and (max-width: 599px){

    #footer{
        width: 100%;
        height: 100px;


        margin-top: 3px;


    }
    .tac_gia{
        padding-top: 20px;
    }
    .tac_gia img{
        width: 205px;
    }

    #bat_tat_nhac{
        position: fixed;
        bottom: 50px;
        right: 10px;
        height: 40px;
        width: 40px;
        opacity: 0.5;
        z-index: 9999;
    }


}