set icon style (width and color)

src/client/styles/scss/_layout_growi.scss

@@ -19,6 +19,9 @@
         font-weight: bold;
       }
     }
+    svg {
+      width: 25px;
+    }
   }
 
   .revision-toc {

src/client/styles/scss/theme/_apply-colors.scss

@@ -247,6 +247,10 @@ pre:not(.hljs):not(.CodeMirror-line) {
 
 .liker-and-seenusers {
   border-bottom-color: $bordercolor-nav-tabs;
+
+  svg {
+    fill: $color-link;
+  }
 }
 
 /*