       .trunk div.trunk {
            bottom: 0;
            left: 50%;
            -webkit-animation-name: rot-root;
            animation-name: rot-root;
            -webkit-animation-duration: 2.5s;
            animation-duration: 2.5s;
        }
        
        .trunk>div,
        .trunk div>div {
            /*opacity:0.9;*/
            top: 0;
            left: 60px;
            -webkit-animation-duration: calc(inherit / 2);
            animation-duration: calc(inherit / 2);
            /* don't work