#snackbar{display:block;position:fixed;top:20px;right:50px;z-index:99999;width:350px;max-height:50%;overflow-y:auto}#snackbar.center{top:45%;width:400px;left:calc((100% - 420px) / 2);right:auto}@media(max-width:420px){#snackbar.center{width:100%;left:auto}}#snackbar.center .alert-warning{border:1px solid red}#snackbar .alert-info{opacity:.9}