fix: sidebar style issue on firefox, fixed docsifyjs#184 (docsifyjs#297)

Author: QingWei-Li

src/themes/basic/_layout.css

@@ -232,7 +232,7 @@ main {
 .sidebar {
   border-right: 1px solid rgba(0, 0, 0, 0.07);
   overflow-y: auto;
-  padding: 40px 0;
+  padding: 40px 0 0;
   position: absolute 0 * 0 0;
   transition: transform 250ms ease-out;
   width: $sidebar-width;
@@ -257,6 +257,7 @@ main {
 
   .sidebar-nav {
     line-height: 2em;
+    padding-bottom: 40px;
   }
 
   ul {

src/themes/vue.css

@@ -47,10 +47,11 @@ body {
 }
 
 .app-sub-sidebar {
-  .section-link {
+  li {
     &::before {
       content: '-';
       padding-right: 4px;
+      float: left;
     }
   }
 }