Fix cursor for some buttons & links (fix #411)

_sass/addon/commons.scss

@@ -811,6 +811,8 @@ $sidebar-display: "sidebar-display";
       i {
         @include sidebar-links;
 
+        @extend %cursor-pointer;
+
         margin: 0;
         font-size: 1.05rem;
         text-align: center;
@@ -914,12 +916,16 @@ $sidebar-display: "sidebar-display";
   border: 1px solid var(--search-wrapper-bg);
   background: var(--search-wrapper-bg);
   padding: 0 0.5rem;
+
   i {
     z-index: 2;
     font-size: 0.9rem;
     color: var(--search-icon-color);
   }
+
   .fa-times-circle { /* button 'clean up' */
+    @extend %cursor-pointer;
+
     visibility: hidden;
   }
 }
@@ -928,6 +934,8 @@ $sidebar-display: "sidebar-display";
   color: var(--link-color);
   margin-left: 1rem;
   display: none;
+
+  @extend %cursor-pointer;
 }
 
 #search-input {

_sass/addon/module.scss

@@ -51,6 +51,10 @@
   margin-top: -2.5rem;
 }
 
+%cursor-pointer {
+  cursor: pointer;
+}
+
 /* ---------- scss mixin --------- */
 
 @mixin no-text-decoration {

_sass/addon/syntax.scss

@@ -199,6 +199,8 @@ div {
     background-color: inherit;
     color: var(--highlight-lineno-color);
 
+    @extend %cursor-pointer;
+
     &[timeout] {
       color: var(--clipboard-checked-color);
       border-color: var(--clipboard-checked-color);

_sass/layout/post.scss

@@ -242,6 +242,9 @@
     > i {
       position: relative;
       bottom: 1px;
+
+      @extend %cursor-pointer;
+
       &:hover {
         @extend %btn-share-hovor;
       }