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assets/global/scss/themes/default/bootstrap_limitless/mixins/_background-variant.scss

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+/* ------------------------------------------------------------------------------
+ *
+ *  # Background mixin
+ *
+ *  Override and extend default background mixin.
+ *
+ * ---------------------------------------------------------------------------- */
+
+// Contextual backgrounds
+@mixin bg-variant($parent, $color) {
+	#{$parent} {
+		background-color: $color !important;
+	}
+}
+
+// Gradient
+@mixin bg-gradient-variant($parent, $color) {
+	#{$parent} {
+		background: $color linear-gradient(180deg, mix($body-bg, $color, 15%), $color) repeat-x;
+	}
+}

assets/global/scss/themes/default/bootstrap_limitless/mixins/_badge.scss

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+/* ------------------------------------------------------------------------------
+ *
+ *  # Badge mixin
+ *
+ *  Override and extend default badge mixin.
+ *
+ * ---------------------------------------------------------------------------- */
+
+@mixin badge-variant($bg) {
+    color: color-yiq($bg);
+    background-color: $bg;
+
+    @at-root a#{&} {
+        @include hover-focus {
+            color: color-yiq($bg);
+            text-decoration: none;
+
+            &:not(.badge-light) {
+                box-shadow: $btn-dark-hover-box-shadow;
+            }
+        }
+    }
+}

assets/global/scss/themes/default/bootstrap_limitless/mixins/_buttons.scss

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+/* ------------------------------------------------------------------------------
+ *
+ *  # Buttons mixin
+ *
+ *  Override and extend default buttons mixin.
+ *
+ * ---------------------------------------------------------------------------- */
+
+
+// Button variants
+//
+// Easily pump out default styles, as well as :hover, :focus, :active,
+// and disabled options for all buttons
+
+// Primary buttons
+@mixin button-variant($background, $border, $hover-background: $background, $hover-border: $border, $active-background: $background, $active-border: $border) {
+    color: color-yiq($background);
+    @include gradient-bg($background);
+
+    @include hover {
+        color: color-yiq($hover-background);
+        @include gradient-bg($hover-background);
+    }
+
+    &:not([disabled]):not(.disabled):active,
+    &:not([disabled]):not(.disabled).active,
+    .show > &.dropdown-toggle {
+        @if $enable-gradients {
+            background-image: none; // Remove the gradient for the pressed/active state
+        }
+    }
+}
+
+// Outline button
+@mixin button-outline-variant($color, $color-hover: #fff) {
+    color: $color;
+    background-color: transparent;
+    background-image: none;
+    border-color: $color;
+
+    @include hover {
+        color: $color-hover;
+        background-color: $color;
+        border-color: $color;
+    }
+
+    &.disabled,
+    &:disabled {
+        color: $color;
+        background-color: transparent;
+    }
+
+    &:not([disabled]):not(.disabled):active,
+    &:not([disabled]):not(.disabled).active,
+    .show > &.dropdown-toggle {
+        color: $color-hover;
+        background-color: $color;
+        border-color: $color;
+    }
+}
+
+// Button sizes
+@mixin button-size($padding-y, $padding-x, $font-size, $line-height, $border-radius) {
+    padding: $padding-y $padding-x;
+    font-size: $font-size;
+    line-height: $line-height;
+    @include border-radius($border-radius, 0);
+}

assets/global/scss/themes/default/bootstrap_limitless/mixins/_caret.scss

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+/* ------------------------------------------------------------------------------
+ *
+ *  # Caret mixin
+ *
+ *  Override and extend default cared mixin.
+ *
+ * ---------------------------------------------------------------------------- */
+
+@mixin caret-down {
+    content: $icon-caret-down;
+}
+
+@mixin caret-up {
+    content: $icon-caret-up;
+}
+
+@mixin caret-right {
+    content: $icon-caret-right;
+}
+
+@mixin caret-left {
+    content: $icon-caret-left;
+}
+
+@mixin caret($caret-direction: down) {
+    @if $enable-caret {
+        &::after {
+            font-family: $icon-font-family;
+            display: inline-block;
+            border: 0;
+            vertical-align: $caret-vertical-align;
+            font-size: $caret-font-size;
+            margin-left: $caret-spacing;
+            line-height: 1;
+            position: relative;
+            @if $caret-direction == down {
+                @include caret-down;
+            } @else if $caret-direction == up {
+                @include caret-up;
+            } @else if $caret-direction == right {
+                @include caret-right;
+            }
+        }
+
+        @if $caret-direction == left {
+            &::after {
+                content: none;
+            }
+
+            &::before {
+                font-family: $icon-font-family;
+                display: inline-block;
+                border: 0;
+                font-size: $caret-font-size;
+                margin-right: ($element-spacer-x * .75);
+                line-height: 1;
+                position: relative;
+                @include caret-left;
+            }
+        }
+
+        &:empty::after {
+            margin-left: 0;
+        }
+    }
+}

assets/global/scss/themes/default/bootstrap_limitless/mixins/_forms.scss

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+/* ------------------------------------------------------------------------------
+ *
+ *  # Forms mixin
+ *
+ *  Override and extend default forms mixin.
+ *
+ * ---------------------------------------------------------------------------- */
+
+// Form control focus state
+@mixin form-control-focus() {
+    &:focus {
+        outline: 0;
+        @if $enable-shadows {
+            box-shadow: $input-box-shadow, $input-focus-box-shadow;
+        } @else {
+            box-shadow: $input-focus-box-shadow;
+        }
+    }
+
+    &:not(.border-1):not(.border-2):not(.border-3):focus {
+        border-color: $input-focus-border-color;
+    }
+}