#msg{
    height: 2rem;
    text-align: center;
    position: fixed;
    top: 50%;
    margin-top: -1rem;
    line-height: 2rem;
    width: 100%;
    z-index: 999;
}
#msg span{
    color: #fff;
    background: rgba(0,0,0,0.6);
    height: 2rem;
    display: inline-block;
    padding: 0 3rem;
    border-radius: 5px;
    z-index: 999;
}