/* 让footer始终固定在页面底部 */
html, body {
    height: 100%;
}
body {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}
#footer, #copyright {
    margin-top: auto;
}

/* Custom footer styles */
#footer {
    padding: 0;
}
#footer .col-md-6,
#footer .col-sm-6 {
    padding: 0;
}
#footer h4 {
    margin-top: 0;
    margin-bottom: 5px;
}
#footer p {
    margin-bottom: 0;
}

#copyright {
    padding: 0;
}
#copyright .col-md-12 {
    padding: 0;
}
#copyright p {
    margin: 0;
}