.footer {
    color: white;
    margin-top: 30px;
    background-color: #263238;
    margin-bottom:0px;
    padding-bottom:0px;
}

    .footer h4 {
        margin-top: 40px;
        margin-bottom: 20px;
    }
    .footer p {
        margin-top: 10px;
        margin-bottom: 10px;
    }
    .footer a {
        list-style: none;
        text-decoration: none;
        color: white;
    }
        .footer a:hover {
            color: red;
            transition: color 0.5s;
            -moz-transition: color 0.5s; /* Firefox 4 */
            -webkit-transition: color 0.5s; /* Safari 和 Chrome */
            -o-transition: color 0.5s; /* Opera */
        }
    .footer .copyright {
        background-color: #20292E;
        color: white;
    }