.Tell {
    position: fixed;
    width: 50px;
    height: 50px;
    bottom: 20px;
    right: 20px;
    border: 3px solid #ff0000;
    border-radius: 50px;
    z-index: 10000;
    background-color: #ffd800;
    text-align: center;
    vertical-align: middle;
}

    .Tell a {
        font-size:25px;
        color:#000000;
    }