在CSS添加如下代码即可:
.nav-top, #navigation-top li a, #navigation-top img,
.post, #primary, .g-row, .widget, .tg-site, .xm4,
.links-group, .nav-links, .cover4x, #scroll,
.links-box, .cms-news-grid-container, .cat-container,
.gw-box, .sx4, .owl-theme, .site-footer, .contactus,
.single-tag, .authorbio, #submit, .login-overlay, .header-sub,
.pagenav-clear, .nav-section, .comment, .comment-respond,
.group-tab-site, .guide-img, .picture-box, .link-box {
filter: grayscale(90%);
-webkit-filter: grayscale(90%);
-moz-filter: grayscale(90%);
-ms-filter: grayscale(90%);
-o-filter: grayscale(90%);
filter: progid:DXImageTransform.Microsoft.BasicImage(grayscale=0.9);
}