@charset "utf-8"; /* CSS Document */
/* layout: navigation panels */
#left-panel, #right-panel, #bottom-panel{
    z-index: 25;
    position: absolute;
    display: block;
    left:0; top:0; bottom:0; 
    width:5vmin;
}
#right-panel{
    left:78vw;
}

#left-panel a, #right-panel a{
    position: absolute;
    display:block;
    width:100%; height:100%;
    background-repeat: no-repeat;
    background-position: center;
    border:0 solid yellow;
    transition: all .5s ease;
}