diff --git a/less/_panels.less b/less/_panels.less
index 61a108c6..584a0611 100644
--- a/less/_panels.less
+++ b/less/_panels.less
@@ -29,78 +29,78 @@
 
 // Contextual variations
 .panel-material-red{
-    .panel-variant(@panel-material-red-border; @panel-material-red-text; @panel-material-red-heading-bg; @panel-material-red-border);
+.panel-variant((darken(spin(@panel-material-red-heading-bg, -10), 5%)); @panel-material-red-text; @panel-material-red-heading-bg; (darken(spin(@panel-material-red-heading-bg, -10), 5%)));
 }
 
 .panel-material-pink{
-    .panel-variant(@panel-material-pink-border; @panel-material-pink-text; @panel-material-pink-heading-bg; @panel-material-pink-border);
+.panel-variant((darken(spin(@panel-material-pink-heading-bg, -10), 5%)); @panel-material-pink-text; @panel-material-pink-heading-bg; (darken(spin(@panel-material-pink-heading-bg, -10), 5%)));
 }
 
 .panel-material-purple{
-    .panel-variant(@panel-material-purple-border; @panel-material-purple-text; @panel-material-purple-heading-bg; @panel-material-purple-border);
+.panel-variant((darken(spin(@panel-material-purple-heading-bg, -10), 5%)); @panel-material-purple-text; @panel-material-purple-heading-bg; (darken(spin(@panel-material-purple-heading-bg, -10), 5%)));
 }
 
 .panel-material-deeppurple{
-    .panel-variant(@panel-material-deeppurple-border; @panel-material-deeppurple-text; @panel-material-deeppurple-heading-bg; @panel-material-deeppurple-border);
+.panel-variant((darken(spin(@panel-material-deeppurple-heading-bg, -10), 5%)); @panel-material-deeppurple-text; @panel-material-deeppurple-heading-bg; (darken(spin(@panel-material-deeppurple-heading-bg, -10), 5%)));
 }
 
 .panel-material-indigo{
-    .panel-variant(@panel-material-indigo-border; @panel-material-indigo-text; @panel-material-indigo-heading-bg; @panel-material-indigo-border);
+.panel-variant((darken(spin(@panel-material-indigo-heading-bg, -10), 5%)); @panel-material-indigo-text; @panel-material-indigo-heading-bg; (darken(spin(@panel-material-indigo-heading-bg, -10), 5%)));
 }
 
 .panel-material-blue{
-    .panel-variant(@panel-material-blue-border; @panel-material-blue-text; @panel-material-blue-heading-bg; @panel-material-blue-border);
+.panel-variant((darken(spin(@panel-material-blue-heading-bg, -10), 5%)); @panel-material-blue-text; @panel-material-blue-heading-bg; (darken(spin(@panel-material-blue-heading-bg, -10), 5%)));
 }
 
 .panel-material-lightblue{
-    .panel-variant(@panel-material-lightblue-border; @panel-material-lightblue-text; @panel-material-lightblue-heading-bg; @panel-material-lightblue-border);
+.panel-variant((darken(spin(@panel-material-lightblue-heading-bg, -10), 5%)); @panel-material-lightblue-text; @panel-material-lightblue-heading-bg; (darken(spin(@panel-material-lightblue-heading-bg, -10), 5%)));
 }
 
 .panel-material-cyan{
-    .panel-variant(@panel-material-cyan-border; @panel-material-cyan-text; @panel-material-cyan-heading-bg; @panel-material-cyan-border);
+.panel-variant((darken(spin(@panel-material-cyan-heading-bg, -10), 5%)); @panel-material-cyan-text; @panel-material-cyan-heading-bg; (darken(spin(@panel-material-cyan-heading-bg, -10), 5%)));
 }
 
 .panel-material-teal{
-    .panel-variant(@panel-material-teal-border; @panel-material-teal-text; @panel-material-teal-heading-bg; @panel-material-teal-border);
+.panel-variant((darken(spin(@panel-material-teal-heading-bg, -10), 5%)); @panel-material-teal-text; @panel-material-teal-heading-bg; (darken(spin(@panel-material-teal-heading-bg, -10), 5%)));
 }
 
 .panel-material-green{
-    .panel-variant(@panel-material-green-border; @panel-material-green-text; @panel-material-green-heading-bg; @panel-material-green-border);
+.panel-variant((darken(spin(@panel-material-green-heading-bg, -10), 5%)); @panel-material-green-text; @panel-material-green-heading-bg; (darken(spin(@panel-material-green-heading-bg, -10), 5%)));
 }
 
 .panel-material-lightgreen{
-    .panel-variant(@panel-material-lightgreen-border; @panel-material-lightgreen-text; @panel-material-lightgreen-heading-bg; @panel-material-lightgreen-border);
+.panel-variant((darken(spin(@panel-material-lightgreen-heading-bg, -10), 5%)); @panel-material-lightgreen-text; @panel-material-lightgreen-heading-bg; (darken(spin(@panel-material-lightgreen-heading-bg, -10), 5%)));
 }
 
 .panel-material-lime{
-    .panel-variant(@panel-material-lime-border; @panel-material-lime-text; @panel-material-lime-heading-bg; @panel-material-lime-border);
+.panel-variant((darken(spin(@panel-material-lime-heading-bg, -10), 5%)); @panel-material-lime-text; @panel-material-lime-heading-bg; (darken(spin(@panel-material-lime-heading-bg, -10), 5%)));
 }
 
 .panel-material-yellow{
-    .panel-variant(@panel-material-yellow-border; @panel-material-yellow-text; @panel-material-yellow-heading-bg; @panel-material-yellow-border);
+.panel-variant((darken(spin(@panel-material-yellow-heading-bg, -10), 5%)); @panel-material-yellow-text; @panel-material-yellow-heading-bg; (darken(spin(@panel-material-yellow-heading-bg, -10), 5%)));
 }
 
 .panel-material-amber{
-    .panel-variant(@panel-material-amber-border; @panel-material-amber-text; @panel-material-amber-heading-bg; @panel-material-amber-border);
+.panel-variant((darken(spin(@panel-material-amber-heading-bg, -10), 5%)); @panel-material-amber-text; @panel-material-amber-heading-bg; (darken(spin(@panel-material-amber-heading-bg, -10), 5%)));
 }
 
 .panel-material-orange{
-    .panel-variant(@panel-material-orange-border; @panel-material-orange-text; @panel-material-orange-heading-bg; @panel-material-orange-border);
+.panel-variant((darken(spin(@panel-material-orange-heading-bg, -10), 5%)); @panel-material-orange-text; @panel-material-orange-heading-bg; (darken(spin(@panel-material-orange-heading-bg, -10), 5%)));
 }
 
 .panel-material-deeporange{
-    .panel-variant(@panel-material-deeporange-border; @panel-material-deeporange-text; @panel-material-deeporange-heading-bg; @panel-material-deeporange-border);
+.panel-variant((darken(spin(@panel-material-deeporange-heading-bg, -10), 5%)); @panel-material-deeporange-text; @panel-material-deeporange-heading-bg; (darken(spin(@panel-material-deeporange-heading-bg, -10), 5%)));
 }
 
 .panel-material-brown{
-    .panel-variant(@panel-material-brown-border; @panel-material-brown-text; @panel-material-brown-heading-bg; @panel-material-brown-border);
+.panel-variant((darken(spin(@panel-material-brown-heading-bg, -10), 5%)); @panel-material-brown-text; @panel-material-brown-heading-bg; (darken(spin(@panel-material-brown-heading-bg, -10), 5%)));
 }
 
 .panel-material-grey{
-    .panel-variant(@panel-material-grey-border; @panel-material-grey-text; @panel-material-grey-heading-bg; @panel-material-grey-border);
+.panel-variant((darken(spin(@panel-material-grey-heading-bg, -10), 5%)); @panel-material-grey-text; @panel-material-grey-heading-bg; (darken(spin(@panel-material-grey-heading-bg, -10), 5%)));
 }
 
 .panel-material-bluegrey{
-    .panel-variant(@panel-material-bluegrey-border; @panel-material-bluegrey-text; @panel-material-bluegrey-heading-bg; @panel-material-bluegrey-border);
+.panel-variant((darken(spin(@panel-material-bluegrey-heading-bg, -10), 5%)); @panel-material-bluegrey-text; @panel-material-bluegrey-heading-bg; (darken(spin(@panel-material-bluegrey-heading-bg, -10), 5%)));
 }
 
diff --git a/less/_variables.less b/less/_variables.less
index 95aa7e93..14c3c17a 100644
--- a/less/_variables.less
+++ b/less/_variables.less
@@ -112,77 +112,58 @@
 
 @panel-material-red-text:                #e84e40;
 @panel-material-red-heading-bg:          #fde0dc;
-@panel-material-red-border:              darken(spin(@panel-material-red-heading-bg, -10), 5%);
 
 @panel-material-pink-text:               #ec407a;
 @panel-material-pink-heading-bg:         #fce4ec;
-@panel-material-pink-border:             darken(spin(@panel-material-pink-heading-bg, -10), 5%);
 
 @panel-material-purple-text:             #ab47bc;
 @panel-material-purple-heading-bg:       #f3e5f5;
-@panel-material-purple-border:           darken(spin(@panel-material-purple-heading-bg, -10), 5%);
 
 @panel-material-deeppurple-text:         #7e57c2;
 @panel-material-deeppurple-heading-bg:   #ede7f6;
-@panel-material-deeppurple-border:       darken(spin(@panel-material-deeppurple-heading-bg, -10), 5%);
 
 @panel-material-indigo-text:             #5c6bc0;
 @panel-material-indigo-heading-bg:       #e8eaf6;
-@panel-material-indigo-border:           darken(spin(@panel-material-indigo-heading-bg, -10), 5%);
 
 @panel-material-blue-text:               #738ffe;
 @panel-material-blue-heading-bg:         #e7e9fd;
-@panel-material-blue-border:             darken(spin(@panel-material-blue-heading-bg, -10), 5%);
 
 @panel-material-lightblue-text:          #29b6f6;
 @panel-material-lightblue-heading-bg:    #e1f5fe;
-@panel-material-lightblue-border:        darken(spin(@panel-material-lightblue-heading-bg, -10), 5%);
 
 @panel-material-cyan-text:               #26c6da;
 @panel-material-cyan-heading-bg:         #e0f7fa;
-@panel-material-cyan-border:             darken(spin(@panel-material-cyan-heading-bg, -10), 5%);
 
 @panel-material-teal-text:               #26a69a;
 @panel-material-teal-heading-bg:         #e0f2f1;
-@panel-material-teal-border:             darken(spin(@panel-material-teal-heading-bg, -10), 5%);
 
 @panel-material-green-text:              #2baf2b;
 @panel-material-green-heading-bg:        #d0f8ce;
-@panel-material-green-border:            darken(spin(@panel-material-green-heading-bg, -10), 5%);
 
 @panel-material-lightgreen-text:         #689f38;
 @panel-material-lightgreen-heading-bg:   #f1f8e9;
-@panel-material-lightgreen-border:       darken(spin(@panel-material-lightgreen-heading-bg, -10), 5%);
 
 @panel-material-lime-text:               #afb42b;
 @panel-material-lime-heading-bg:         #f9fbe7;
-@panel-material-lime-border:             darken(spin(@panel-material-lime-heading-bg, -10), 5%);
 
 @panel-material-yellow-text:             #f9a825;
 @panel-material-yellow-heading-bg:       #fffde7;
-@panel-material-yellow-border:           darken(spin(@panel-material-yellow-heading-bg, -10), 5%);
 
 @panel-material-amber-text:              #ffb300;
 @panel-material-amber-heading-bg:        #fff8e1;
-@panel-material-amber-border:            darken(spin(@panel-material-amber-heading-bg, -10), 5%);
 
 @panel-material-orange-text:             #ffa726;
 @panel-material-orange-heading-bg:       #fff3e0;
-@panel-material-orange-border:           darken(spin(@panel-material-orange-heading-bg, -10), 5%);
 
 @panel-material-deeporange-text:         #ff7043;
 @panel-material-deeporange-heading-bg:   #fbe9e7;
-@panel-material-deeporange-border:       darken(spin(@panel-material-deeporange-heading-bg, -10), 5%);
 
 @panel-material-brown-text:              #8d6e63;
 @panel-material-brown-heading-bg:        #d7ccc8;
-@panel-material-brown-border:            darken(spin(@panel-material-brown-heading-bg, -10), 5%);
 
 @panel-material-grey-text:               #9e9e9e;
 @panel-material-grey-heading-bg:         #f5f5f5;
-@panel-material-grey-border:             darken(spin(@panel-material-grey-heading-bg, -10), 5%);
 
 @panel-material-bluegrey-text:           #607d8b;
 @panel-material-bluegrey-heading-bg:     #cfd8dc;
-@panel-material-bluegrey-border:         darken(spin(@panel-material-bluegrey-heading-bg, -10), 5%);