Use translucent box shadow on hr elements; colorize hr elements within alert components

less/alerts.less

@@ -13,15 +13,21 @@
   background-color: @state-warning-background;
   border: 1px solid @state-warning-border;
   border-radius: @border-radius-base;
-}
-.alert h4 {
-  margin-top: 0;
-  // Specified for the h4 to prevent conflicts of changing @headingsColor
-  color: inherit;
+
+  // Headings for larger alerts
+  h4 {
+    margin-top: 0;
+    // Specified for the h4 to prevent conflicts of changing @headingsColor
+    color: inherit;
+  }
+  // Match the hr to the border of the alert
+  hr {
+    border-top-color: darken(@state-warning-border, 5%);
+  }
 }
 
 // Adjust close link position
-.alert .close {
+.close {
   position: relative;
   top: -2px;
   right: -21px;
@@ -36,17 +42,26 @@
   background-color: @state-success-background;
   border-color: @state-success-border;
   color: @state-success-text;
+  hr {
+    border-top-color: darken(@state-success-border, 5%);
+  }
 }
 .alert-danger,
 .alert-error {
   background-color: @state-error-background;
   border-color: @state-error-border;
   color: @state-error-text;
+  hr {
+    border-top-color: darken(@state-error-border, 5%);
+  }
 }
 .alert-info {
   background-color: @state-info-background;
   border-color: @state-info-border;
   color: @state-info-text;
+  hr {
+    border-top-color: darken(@state-info-border, 5%);
+  }
 }
 
 // Block alerts

less/type.less

@@ -178,6 +178,7 @@ hr {
   border: 0;
   border-top: 1px solid @hr-border;
   border-bottom: 1px solid #fff;
+  border-bottom: 1px solid rgba(255,255,255,.5);
 }
 
 // Abbreviations and acronyms