增加CRD自定义资源

gitbook/gitbook-plugin-back-to-top-button/plugin.css

@@ -1,55 +0,0 @@
-.back-to-top {
-    position: fixed;
-    bottom: 25px;
-    right: 25px;
-    background: rgba(0, 0, 0, 0.5);
-    width: 50px;
-    height: 50px;
-    display: block;
-    text-decoration: none;
-    -webkit-border-radius: 35px;
-    -moz-border-radius: 35px;
-    border-radius: 35px;
-    display: none;
-}
-.back-to-top i {
-    color: #fff;
-    margin: 0;
-    position: relative;
-    left: 15px;
-    top: 14px;
-    font-size: 22px;
-}
-.back-to-top:hover {
-    background: rgba(0, 0, 0, 0.9);
-    cursor: pointer;	
-}
-.book.color-theme-1 .back-to-top {
-    background: rgba(112, 66, 20, 0.5);
-}
-.book.color-theme-1 .back-to-top i {
-    color: #f3eacb;
-}
-.book.color-theme-1 .back-to-top:hover {
-    background: rgba(112, 66, 20, 0.9);
-}
-.book.color-theme-2 .back-to-top {
-    background: rgba(189, 202, 219, 0.5);
-}
-.book.color-theme-2 .back-to-top i {
-    color: #1C1F2B;
-}
-.book.color-theme-2 .back-to-top:hover {
-    background: rgba(189, 202, 219, 0.9);
-}
-
-@media only screen 
-  and (min-device-width: 320px) 
-  and (max-device-width: 480px)
-  and (-webkit-min-device-pixel-ratio: 2)
-  and (orientation: portrait) {
-	.back-to-top {
-		bottom: 10px;
-		right: 10px;
-	}
-}