.mod_panel{
    color:#000;
    background-color: #fff;
    width: 40%;
    height: 100vh;
    z-index: 999;
    position: fixed;
    right: 0;
    top: 0;
    transform: translateX(200%);
    transition: all .4s ease-in-out;
    -webkit-transition: all .4s ease-in-out;
    -moz-transition: all .4s ease-in-out;
    -ms-transition: all .4s ease-in-out
}

.mod_panel.open{
    transform: translateX(0)
}

.mod_panel_bg {
    background-color: rgba(0, 0, 0, .4);
    position: fixed;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    z-index: 99;
    opacity: 0;
    display: none;
    transform: translateX(200%);
    transition: all .4s ease-in-out;
    -webkit-transition: all .4s ease-in-out;
    -moz-transition: all .4s ease-in-out;
    -ms-transition: all .4s ease-in-out
}

.mod_panel_bg.open {
    opacity: 1;
    display: block;
    transform: translateX(0)
}