.nav-bar-side(@width: 90%) { 
    display: block;
    height: 100%;  
    width: @width;
    position: absolute;
    padding-top: 72pt;
    z-index: 1;
    top: 0; 
    right: -@width; 
    background-color: extract(@CLR_1, 9);
    transition: all 0.5s ease 0s;
    box-shadow: 0px 4px 9px extract(@CLR_1, 6);  
    padding-bottom: 20pt;
}