definicao de layout

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

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+.select2-container--default {
+  @import "single";
+  @import "multiple";
+
+  &.select2-container--open.select2-container--above {
+    .select2-selection--single, .select2-selection--multiple {
+      border-top-left-radius: 0;
+      border-top-right-radius: 0;
+    }
+  }
+
+  &.select2-container--open.select2-container--below {
+    .select2-selection--single, .select2-selection--multiple {
+      border-bottom-left-radius: 0;
+      border-bottom-right-radius: 0;
+    }
+  }
+
+  .select2-search--dropdown {
+    .select2-search__field {
+      border: 1px solid #e6edef;
+    }
+  }
+
+  .select2-search--inline {
+    .select2-search__field {
+      background: transparent;
+      border: none;
+      outline: 0;
+      box-shadow: none;
+      -webkit-appearance: textfield;
+    }
+  }
+
+ 
+
+  .select2-results > .select2-results__options {
+    max-height: 200px;
+    overflow-y: auto;
+  }
+
+  .select2-results__option {
+    &[role=group] {
+      padding: 0;
+    }
+
+    &[aria-disabled=true] {
+      color: #999;
+    }
+
+    &[aria-selected=true] {
+      background-color: #ddd;
+    }
+
+    .select2-results__option {
+      padding-left: 1em;
+
+      .select2-results__group {
+        padding-left: 0;
+      }
+
+      .select2-results__option {
+        margin-left: -1em;
+        padding-left: 2em;
+
+        .select2-results__option {
+          margin-left: -2em;
+          padding-left: 3em;
+
+          .select2-results__option {
+            margin-left: -3em;
+            padding-left: 4em;
+
+            .select2-results__option {
+              margin-left: -4em;
+              padding-left: 5em;
+
+              .select2-results__option {
+                margin-left: -5em;
+                padding-left: 6em;
+              }
+            }
+          }
+        }
+      }
+    }
+  }
+
+  .select2-results__option--highlighted[aria-selected] {
+    background-color: #5897fb;
+    color: white;
+  }
+
+  .select2-results__group {
+    cursor: default;
+    display: block;
+    padding: 6px;
+  }
+}

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

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+.select2-selection--multiple {
+  background-color: white;
+  border: 1px solid #aaa;
+  border-radius: 4px;
+  cursor: text;
+
+  .select2-selection__rendered {
+    box-sizing: border-box;
+    list-style: none;
+    margin: 0;
+    padding: 5px 5px 0 0;
+    width: 100%;
+    li {
+      list-style: none;
+    }
+  }
+
+  .select2-selection__placeholder {
+    color: #999;
+
+    margin-top: 5px;
+
+    float: left;
+  }
+
+  .select2-selection__clear {
+    cursor: pointer;
+    float: right;
+    font-weight: bold;
+    margin-top: 5px;
+    margin-right: 10px;
+  }
+
+  .select2-selection__choice {
+    background-color: #e4e4e4;
+
+    border: 1px solid #aaa;
+    border-radius: 4px;
+    cursor: default;
+
+    float: left;
+
+    margin-right: 5px;
+    margin-top: 5px;
+    padding: 0 5px;
+  }
+
+  .select2-selection__choice__remove {
+    color: #999;
+    cursor: pointer;
+
+    display: inline-block;
+    font-weight: bold;
+
+    margin-right: 2px;
+
+    &:hover {
+      color: #333;
+    }
+  }
+}
+
+&[dir="rtl"] {
+  .select2-selection--multiple {
+    .select2-selection__choice, .select2-selection__placeholder, .select2-search--inline {
+      float: right;
+    }
+
+    .select2-selection__choice {
+      margin-left: 5px;
+      margin-right: auto;
+    }
+
+    .select2-selection__choice__remove {
+      margin-left: 2px;
+      margin-right: auto;
+    }
+  }
+}
+
+&.select2-container--focus {
+  .select2-selection--multiple {
+    border: solid black 1px;
+    outline: 0;
+  }
+}
+
+&.select2-container--disabled {
+  .select2-selection--multiple {
+    background-color: #eee;
+    cursor: default;
+  }
+
+  .select2-selection__choice__remove {
+    display: none;
+  }
+}

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

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+.select2-selection--single {
+  background-color: #fff;
+  border: 1px solid #aaa;
+  border-radius: 4px;
+
+  .select2-selection__rendered {
+    color: #444;
+    line-height: 28px;
+  }
+
+  .select2-selection__clear {
+    cursor: pointer;
+    float: right;
+    font-weight: bold;
+  }
+
+  .select2-selection__placeholder {
+    color: #999;
+  }
+
+  .select2-selection__arrow {
+    height: 26px;
+
+    position: absolute;
+
+    top: 1px;
+    right: 1px;
+
+    width: 20px;
+
+    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 {
+      left: 1px;
+      right: auto;
+    }
+  }
+}
+
+&.select2-container--disabled {
+  .select2-selection--single {
+    background-color: #eee;
+    cursor: default;
+
+    .select2-selection__clear {
+      display: none;
+    }
+  }
+}
+
+&.select2-container--open {
+  .select2-selection--single {
+    .select2-selection__arrow {
+      b {
+        border-color: transparent transparent #888 transparent;
+        border-width: 0 4px 5px 4px;
+      }
+    }
+  }
+}