Improved the responsive of sidebar bottom.

_includes/sidebar.html

@@ -55,12 +55,13 @@
 
 </div><!-- #nav-wrapper -->
 
-<div class="sidebar-bottom d-flex justify-content-around mt-4">
+<div class="sidebar-bottom d-flex flex-wrap justify-content-around mt-4">
 
   {% if site.theme_mode == "dual" %}
   <span id="mode-toggle-wrapper">
     {% include mode-toggle.html %}
   </span>
+  <span class="icon-border"></span>
   {% endif %}
 
   <a href="https://github.com/{{ site.github.username }}" target="_blank">

assets/css/main.scss

@@ -15,6 +15,7 @@
   color: rgba(255, 255, 255, 0.5);
   transition: color 0.35s ease-in-out;
   user-select: none;
+  margin: 0 .25rem;
 }
 
 @mixin icon-round($diameter) {
@@ -65,6 +66,10 @@ body {
   @include sidebar-icon;
 }
 
+#sidebar .sidebar-bottom .icon-border+a { // the icon behide mode-toggle
+  margin-left: .1rem;
+}
+
 #sidebar .nav-item {
   height: 20%;
 }
@@ -234,35 +239,38 @@ body {
   margin-top: 2rem;
 }
 
-.sidebar-bottom {
+
+#sidebar .sidebar-bottom {
   font-size: 1.2rem;
-  margin: 2rem 2.5rem;
-  flex-shrink: 0;
-  -webkit-flex-shrink: 0;
-  -ms-flex-shrink: 0;
-  /*box-shadow: inset 0 0 0.25em 0 rgba(0, 0, 0, 0.22);*/
-}
+  margin: 2rem 2.5rem 1.6rem;
 
-#sidebar .sidebar-bottom a:hover,
-#sidebar #mode-toggle-wrapper:hover {
+  a {
+    margin-bottom: .5rem; // icons may have multi lines
+  }
+
+  a:hover, #mode-toggle-wrapper>i:hover {
     color: #fff;
-}
+  }
 
-#mode-toggle-wrapper {
+  #mode-toggle-wrapper {
+    i {
       @include sidebar-icon;
+      margin-right: 0;
       font-size: 1.05rem;
       text-align: center;
-}
+      position: relative;
+      bottom: 1px;
+    }
+  }
 
-#mode-toggle-wrapper::after {
-  content: "";
+  .icon-border {
     background: #525354;
     width: 1px;
     height: 8px;
-  margin-left: 7px;
-  margin-right: -6px;
-  margin-bottom: 3px;
-  display: inline-block;
+    margin-top: .6rem;
+    margin-left: .25rem;
+    margin-right: .25rem;
+  }
 }
 
 
@@ -1154,12 +1162,10 @@ table tbody td {
     margin-right: 1rem;
   }
 
-  .sidebar-bottom a {
-    padding: 0 0.6rem;
-  }
+  #sidebar .sidebar-bottom {
+    margin-left: 1.5rem;
+    margin-right: 1.5rem;
 
-  #mode-toggle-wrapper {
-    padding-left: 1.2rem;
   }
 
   #main-wrapper {
@@ -1392,27 +1398,23 @@ table tbody td {
     display: inline-block!important;
   }
 
-  .sidebar-bottom {
+  #sidebar .sidebar-bottom {
     margin-left: 3.5rem;
     margin-right: 3rem;
     font-size: 1.3rem;
-    padding-bottom: 1rem;
-  }
-
-  .sidebar-bottom a {
+    a {
       border: 1px solid;
       border-radius: 50%;
       font-size: 1rem;
       width: 2rem;
       height: 2rem;
       text-align: center;
-  }
-
-  .sidebar-bottom a>i {
+      i {
         text-align: center;
         width: 1.25em;
         padding-top: .45rem;
       }
+    }
 
   #mode-toggle-wrapper {
     font-size: .9rem;
@@ -1421,13 +1423,22 @@ table tbody td {
   #mode-toggle-wrapper>i {
     @include icon-round(2rem);
     padding-top: 0.5rem;
+    bottom: 0;
   }
 
-  #mode-toggle-wrapper::after {
+  .icon-border {
       height: 14px;
+      margin-left: .2rem;
+      margin-right: .2rem;
       margin-bottom: 0;
     }
 
+    .icon-border+a {
+      margin-left: 0;
+    }
+  }
+
+
   footer>div.d-flex {
     max-width: 1150px;
   }