自定义 CSS 样式：

/* 固定左侧标签栏 */
@media (min-width:992px) {
	.sideNav, .sideNav>ul {
		width: 190px;
		position: sticky;
		top: 80px;
	}
	.App {
		overflow-x: visible;
	}
	/* 版块页不受影响 */
	.CategoriesPage.TagsPage .sideNav,
	.CategoriesPage.TagsPage .sideNav>ul {
		position: unset;
	}
	/* 标签页不受影响 */
	.TagsPage.TagsPage .sideNav,
	.TagsPage.TagsPage .sideNav>ul {
		position: unset;
	}
}

.Button .Button-label{ font-weight:600;}
.DiscussionListItem{
    padding: 10px;
    margin: 10px;
    background:#ffffff30;
    border-radius: 10px;
}
.Header-title{
    font-family: monospace;
    font-weight: 600;
    font-size:25px;
}
.DiscussionListItem:hover, .DiscussionListItem:focus {
    background: #ffffff;
    transition: all 300ms;
    box-shadow:10px 10px 20px #00000020;
}
body{background:#f5f5f5;letter-spacing: 1px;}

@media (max-width: 767px)
{.App-content {background:#f5f5f5;}}

a.scroll-up {
    background-color: #0077e6;
    width:30px;
    line-height: 3.5;
}

.scroll-up:hover, .scroll-up:focus{background-color: #0077e6!important;}

.DiscussionListItem-main mark {background: #ffff80 !important;}
.Header-title {
	overflow: hidden;
}

.Header-title:before {
	content: "";
	backdrop-filter: blur(3px);
	-webkit-backdrop-filter: blur(3px);
	position: absolute;
	width: 100px;
	height: 10px;
	background-color: rgba(255, 255, 255, .9);
	-webkit-transform: rotate(-45deg);
	-moz-transform: rotate(-45deg);
	-ms-transform: rotate(-45deg);
	-o-transform: rotate(-45deg);
	transform: rotate(-45deg);
	-webkit-animation: searchLights 1s ease-in 1s infinite;
	-o-animation: searchLights 1s ease-in 1s infinite;
	animation: searchLights 3s ease-in 1s infinite;
}

@keyframes searchLights {
	0% {
		left: 0%;
		top: 0px;
	}

	100% {
		left: 50%;
		top: 0px;
	}
}

继续..

自定义页脚：

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