fix typo

gitbook/gitbook-plugin-page-toc-button/plugin.css

@@ -1,106 +0,0 @@
-.page-toc-button {
-    background: rgba(0, 0, 0, 0.5);
-    border-radius: 35px;
-    display: block;
-    position: fixed;
-    top: 68px;
-    right: 25px;
-    width: 50px;
-    height: 50px;
-    text-decoration: none;
-    -webkit-border-radius: 35px;
-    -moz-border-radius: 35px;
-}
-.page-toc-button i {
-    color: #fff;
-    margin: 0;
-    position: relative;
-    left: 15px;
-    top: 14px;
-    font-size: 22px;
-}
-.page-toc-button .page-toc-menu {
-    display: none;
-    text-align: left;
-}
-.page-toc-button:hover {
-    background: rgba(0, 0, 0, 0.9);
-    border-radius: 0;
-    cursor: pointer;	
-    top: 68px;
-    right: 25px;
-    width: auto;
-    height: auto;
-    max-height: 70%;
-    font-size: 14px;
-    text-align: right;
-    white-space: nowrap;
-    -webkit-border-radius: 0;
-    -moz-border-radius: 0;
-    overflow-y: auto;
-    overflow-x: hidden;
-}
-.page-toc-button:hover i {
-    display: none;
-}
-.page-toc-button:hover .page-toc-menu {
-    display: block;
-}
-.page-toc-menu li {
-    color: #fff;
-    padding-left: 5px;
-    padding-right: 25px;
-    padding-top: 5px;
-    padding-bottom: 5px;
-}
-.page-toc-menu a {
-    color: #fff;
-}
-.page-toc-menu a:hover {
-    text-decoration: underline;
-}
-.book.color-theme-1 .page-toc-button {
-    background: rgba(112, 66, 20, 0.5);
-}
-.book.color-theme-1 .page-toc-button i {
-    color: #f3eacb;
-}
-.book.color-theme-1 .page-toc-button:hover {
-    background: rgba(112, 66, 20, 0.9);
-}
-.book.color-theme-1 .page-toc-menu li {
-    color: #f3eacb;
-}
-.book.color-theme-1 .page-toc-menu a {
-    color: #f3eacb;
-}
-.book.color-theme-2 .page-toc-button {
-    background: rgba(189, 202, 219, 0.5);
-}
-.book.color-theme-2 .page-toc-button i {
-    color: #1C1F2B
-}
-.book.color-theme-2 .page-toc-button:hover {
-    background: rgba(189, 202, 219, 0.9);
-}
-.book.color-theme-2 .page-toc-menu li {
-    color: #fff;
-}
-.book.color-theme-2 .page-toc-menu a {
-    color: #fff;
-}
-
-@media only screen 
-  and (max-height: 240px) {
-	.page-toc-button {
-		display: none;
-	}
-}
-@media only screen 
-  and (min-device-width: 320px) 
-  and (max-device-width: 480px)
-  and (-webkit-min-device-pixel-ratio: 2) {
-	.page-toc-button {
-		display: none;
-	}
-}