definicao de layout

public/assets/scss/select2/theme/classic/_defaults.scss

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+$remove-color: #888 !default;
+$remove-hover-color: #555 !default;
+$remove-width: 20px !default;
+
+$selection-color: #444 !default;
+
+$border-color: #aaa !default;
+$border-radius: 4px !default;
+
+$focus-border-color: #5897fb !default;
+
+$container-height: 28px !default;
+
+$selection-bg-top-color: white !default;
+$selection-bg-bottom-color: #eeeeee !default;
+
+$container-placeholder-color: #999 !default;
+
+$container-focus-border-color: blue !default;
+
+$selection-opened-bg-top-color: $selection-bg-bottom-color !default;
+$selection-opened-bg-bottom-color: $selection-bg-top-color !default;
+
+$dropdown-z-index: 1 !default;
+
+$dropdown-bg-color: $selection-bg-top-color !default;
+
+$results-max-height: 200px !default;
+$results-nested-padding: 20px !default;
+
+$results-choice-bg-hover-color: #3875d7 !default;
+$results-choice-fg-hover-color: white !default;
+
+$results-choice-fg-unselectable-color: grey !default;

public/assets/scss/select2/theme/classic/_layout.scss

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+@import "defaults";
+@import "../../mixins/gradients";
+
+.select2-container--classic {
+  @import "single";
+  @import "multiple";
+
+  .select2-search--dropdown {
+    .select2-search__field {
+      border: 1px solid $border-color;
+      outline: 0;
+    }
+  }
+
+  .select2-search--inline {
+    .select2-search__field {
+      outline: 0;
+      box-shadow: none;
+    }
+  }
+
+  .select2-dropdown {
+    background-color: $dropdown-bg-color;
+    border: 1px solid transparent;
+  }
+
+  .select2-dropdown--above {
+    border-bottom: none;
+  }
+
+  .select2-dropdown--below {
+    border-top: none;
+  }
+
+  .select2-results > .select2-results__options {
+    max-height: $results-max-height;
+    overflow-y: auto;
+  }
+
+  .select2-results__option {
+    &[role=group] {
+      padding: 0;
+    }
+
+    &[aria-disabled=true] {
+      color: $results-choice-fg-unselectable-color;
+    }
+  }
+
+  .select2-results__option--highlighted[aria-selected] {
+    background-color: $results-choice-bg-hover-color;
+    color: $results-choice-fg-hover-color;
+  }
+
+  .select2-results__group {
+    cursor: default;
+    display: block;
+    padding: 6px;
+  }
+
+  &.select2-container--open .select2-dropdown {
+    border-color: $focus-border-color;
+  }
+}

public/assets/scss/select2/theme/classic/_multiple.scss

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+.select2-selection--multiple {
+  background-color: white;
+
+  border: 1px solid $border-color;
+  border-radius: $border-radius;
+
+  cursor: text;
+
+  outline: 0;
+
+  &:focus {
+    border: 1px solid $focus-border-color;
+  }
+
+  .select2-selection__rendered {
+    list-style: none;
+    margin: 0;
+    padding: 0 5px;
+  }
+
+  .select2-selection__clear {
+    display: none;
+  }
+
+  .select2-selection__choice {
+    background-color: #e4e4e4;
+
+    border: 1px solid $border-color;
+    border-radius: $border-radius;
+
+    cursor: default;
+
+    float: left;
+
+    margin-right: 5px;
+    margin-top: 5px;
+    padding: 0 5px;
+  }
+
+  .select2-selection__choice__remove {
+    color: $remove-color;
+    cursor: pointer;
+
+    display: inline-block;
+    font-weight: bold;
+
+    margin-right: 2px;
+
+    &:hover {
+      color: $remove-hover-color;
+    }
+  }
+}
+
+&[dir="rtl"] {
+  .select2-selection--multiple {
+    .select2-selection__choice {
+      float: right;
+      margin-left: 5px;
+      margin-right: auto;
+    }
+
+    .select2-selection__choice__remove {
+      margin-left: 2px;
+      margin-right: auto;
+    }
+  }
+}
+
+&.select2-container--open {
+  .select2-selection--multiple {
+    border: 1px solid $focus-border-color;
+  }
+
+  &.select2-container--above {
+    .select2-selection--multiple {
+      border-top: none;
+      border-top-left-radius: 0;
+      border-top-right-radius: 0;
+    }
+  }
+
+  &.select2-container--below {
+    .select2-selection--multiple {
+      border-bottom: none;
+      border-bottom-left-radius: 0;
+      border-bottom-right-radius: 0;
+    }
+  }
+}

public/assets/scss/select2/theme/classic/_single.scss

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+.select2-selection--single {
+  background-color: mix($selection-bg-top-color, $selection-bg-bottom-color);
+
+  border: 1px solid $border-color;
+  border-radius: $border-radius;
+
+  outline: 0;
+
+  @include gradient-vertical($selection-bg-top-color, $selection-bg-bottom-color, 50%, 100%);
+
+  &:focus {
+    border: 1px solid $focus-border-color;
+  }
+
+  .select2-selection__rendered {
+    color: #444;
+    line-height: 28px;
+  }
+
+  .select2-selection__clear {
+    cursor: pointer;
+    float: right;
+    font-weight: bold;
+    margin-right: 10px;
+  }
+
+  .select2-selection__placeholder {
+    color: #999;
+  }
+
+  .select2-selection__arrow {
+    background-color: #ddd;
+
+    border: none;
+    border-left: 1px solid $border-color;
+    border-top-right-radius: $border-radius;
+    border-bottom-right-radius: $border-radius;
+
+    height: 26px;
+
+    position: absolute;
+
+    top: 1px;
+    right: 1px;
+
+    width: 20px;
+
+    @include gradient-vertical(#eeeeee, #cccccc, 50%, 100%);
+
+    b {
+      border-color: #888 transparent transparent transparent;
+      border-style: solid;
+      border-width: 5px 4px 0 4px;
+
+      height: 0;
+      left: 50%;
+
+      margin-left: -4px;
+      margin-top: -2px;
+
+      position: absolute;
+
+      top: 50%;
+      width: 0;
+    }
+  }
+}
+
+&[dir="rtl"] {
+  .select2-selection--single {
+    .select2-selection__clear {
+      float: left;
+    }
+
+    .select2-selection__arrow {
+      border: none;
+      border-right: 1px solid $border-color;
+
+      border-radius: 0;
+      border-top-left-radius: $border-radius;
+      border-bottom-left-radius: $border-radius;
+
+      left: 1px;
+      right: auto;
+    }
+  }
+}
+
+&.select2-container--open {
+  .select2-selection--single {
+    border: 1px solid $focus-border-color;
+
+    .select2-selection__arrow {
+      background: transparent;
+
+      border: none;
+
+      b {
+        border-color: transparent transparent #888 transparent;
+        border-width: 0 4px 5px 4px;
+      }
+    }
+  }
+
+  &.select2-container--above {
+    .select2-selection--single {
+      border-top: none;
+      border-top-left-radius: 0;
+      border-top-right-radius: 0;
+
+      @include gradient-vertical($selection-opened-bg-bottom-color, $selection-opened-bg-top-color, 0%, 50%);
+    }
+  }
+
+  &.select2-container--below {
+    .select2-selection--single {
+      border-bottom: none;
+      border-bottom-left-radius: 0;
+      border-bottom-right-radius: 0;
+
+      @include gradient-vertical($selection-opened-bg-top-color, $selection-opened-bg-bottom-color, 50%, 100%);
+    }
+  }
+}