update assets

assets/stylesheets/bootswatch/cyborg/_bootswatch.scss

@@ -37,10 +37,14 @@ $web-font-path: "https://fonts.googleapis.com/css?family=Roboto:400,700" !defaul
 // Buttons =====================================================================
 
 .btn {
-
-  &-warning,
-  &-warning:hover {
-    color: $white;
+  @each $color, $value in $theme-colors {
+    &-#{$color} {
+      @if $enable-gradients {
+        background: $value linear-gradient(180deg, mix($white, $value, 15%), $value) repeat-x;
+      } @else {
+        background-color: $value;
+      }
+    }
   }
 }
 
@@ -222,7 +226,11 @@ legend {
 
   @each $color, $value in $theme-colors {
     &-#{$color} {
-      background-color: $value;
+      @if $enable-gradients {
+        background: $value linear-gradient(180deg, mix($white, $value, 15%), $value) repeat-x;
+      } @else {
+        background-color: $value;
+      }
     }
   }
 

assets/stylesheets/bootswatch/cyborg/_variables.scss

@@ -37,6 +37,8 @@ $danger:        $red !default;
 $light:         $gray-800 !default;
 $dark:          $gray-400 !default;
 
+$yiq-contrasted-threshold:  175 !default;
+
 
 // Body
 

assets/stylesheets/bootswatch/darkly/_bootswatch.scss

@@ -208,7 +208,11 @@ $web-font-path: "https://fonts.googleapis.com/css?family=Lato:400,700,400italic"
 
   @each $color, $value in $theme-colors {
     &-#{$color} {
-      background-color: $value;
+      @if $enable-gradients {
+        background: $value linear-gradient(180deg, mix($white, $value, 15%), $value) repeat-x;
+      } @else {
+        background-color: $value;
+      }
     }
   }
 }

assets/stylesheets/bootswatch/flatly/_bootswatch.scss

@@ -217,7 +217,11 @@ $web-font-path: "https://fonts.googleapis.com/css?family=Lato:400,700,400italic"
 
   @each $color, $value in $theme-colors {
     &-#{$color} {
-      background-color: $value;
+      @if $enable-gradients {
+        background: $value linear-gradient(180deg, mix($body-bg, $value, 15%), $value) repeat-x;
+      } @else {
+        background-color: $value;
+      }
     }
   }
 

assets/stylesheets/bootswatch/litera/_bootswatch.scss

@@ -239,7 +239,11 @@ table,
 
   @each $color, $value in $theme-colors {
     &-#{$color} {
-      background-color: $value;
+      @if $enable-gradients {
+        background: $value linear-gradient(0deg, mix($body-bg, $value, 15%), $value) repeat-x;
+      } @else {
+        background-color: $value;
+      }
     }
   }
 

assets/stylesheets/bootswatch/materia/_bootswatch.scss

@@ -564,14 +564,19 @@ select.form-control {
 
 .alert {
   padding-right: 2.5rem;
+  border: none;
 
   &, h1, h2, h3, h4, h5, h6 {
     color: #fff;
   }
 
   @each $color, $value in $theme-colors {
     &-#{$color} {
-      background-color: $value;
+      @if $enable-gradients {
+        background: $value linear-gradient(180deg, mix($body-bg, $value, 15%), $value) repeat-x;
+      } @else {
+        background-color: $value;
+      }
     }
   }
 

assets/stylesheets/bootswatch/materia/_variables.scss

@@ -39,6 +39,8 @@ $dark:          $gray-800 !default;
 
 $yiq-contrasted-threshold:  170 !default;
 
+$enable-gradients: true;
+
 // Body
 
 $body-color:    $gray-700 !default;

assets/stylesheets/bootswatch/solar/_bootswatch.scss

@@ -11,6 +11,18 @@ $web-font-path: "https://fonts.googleapis.com/css?family=Source+Sans+Pro" !defau
 
 // Buttons =====================================================================
 
+.btn {
+  @each $color, $value in $theme-colors {
+    &-#{$color} {
+      @if $enable-gradients {
+        background: $value linear-gradient(180deg, mix($white, $value, 15%), $value) repeat-x;
+      } @else {
+        background-color: $value;
+      }
+    }
+  }
+}
+
 // Typography ==================================================================
 
 // Tables ======================================================================
@@ -162,7 +174,11 @@ $web-font-path: "https://fonts.googleapis.com/css?family=Source+Sans+Pro" !defau
 
   @each $color, $value in $theme-colors {
     &-#{$color} {
-      background-color: $value;
+      @if $enable-gradients {
+        background: $value linear-gradient(180deg, mix($white, $value, 15%), $value) repeat-x;
+      } @else {
+        background-color: $value;
+      }
     }
   }
 

assets/stylesheets/bootswatch/solar/_variables.scss

@@ -38,6 +38,8 @@ $danger:        $red !default;
 $light:         $gray-100 !default;
 $dark:          $gray-800 !default;
 
+$enable-gradients: true;
+
 // Body
 
 $body-bg:                   $gray-900 !default;

assets/stylesheets/bootswatch/superhero/_bootswatch.scss

@@ -16,10 +16,14 @@ $web-font-path: "https://fonts.googleapis.com/css?family=Lato:300,400,700" !defa
 // Buttons =====================================================================
 
 .btn {
-
-  &-info,
-  &-warning {
-    color: $white;
+  @each $color, $value in $theme-colors {
+    &-#{$color} {
+      @if $enable-gradients {
+        background: $value linear-gradient(180deg, mix($white, $value, 15%), $value) repeat-x;
+      } @else {
+        background-color: $value;
+      }
+    }
   }
 }
 
@@ -220,7 +224,11 @@ label,
 
   @each $color, $value in $theme-colors {
     &-#{$color} {
-      background-color: $value;
+      @if $enable-gradients {
+        background: $value linear-gradient(180deg, mix($white, $value, 15%), $value) repeat-x;
+      } @else {
+        background-color: $value;
+      }
     }
   }
 }

assets/stylesheets/bootswatch/superhero/_variables.scss

@@ -37,6 +37,8 @@ $danger:        $red !default;
 $light:         lighten($gray-200, 25%) !default;
 $dark:          $gray-200 !default;
 
+$yiq-contrasted-threshold:  185 !default;
+
 // Body
 
 $body-bg:                   #2B3E50 !default;
@@ -70,7 +72,7 @@ $input-border-color:                transparent !default;
 
 $input-group-addon-color:           $body-color !default;
 
-$custom-file-color:                 $white !default;
+$custom-file-button-color:          $white !default;
 $custom-file-border-color:          $gray-200 !default;
 
 // Dropdowns