bulma/sass/form/select.scss

$select-colors: $form-colors !default;

.#{$class-prefix}select {
  display: inline-block;
  max-width: 100%;
  position: relative;
  vertical-align: top;

  &:not(.is-multiple) {
    height: $input-height;
  }

  &:not(.is-multiple):not(.is-loading) {
    &::after {
      @extend %arrow;

      border-color: $input-arrow;

      @include ltr-position(1.125em);

      z-index: 4;
    }
  }

  &.is-rounded {
    select {
      border-radius: $radius-rounded;

      @include ltr-property("padding", 1em, false);
    }
  }

  select {
    @extend %input;

    cursor: pointer;
    display: block;
    font-size: 1em;
    max-width: 100%;
    outline: none;

    &::-ms-expand {
      display: none;
    }

    &[disabled]:hover,
    fieldset[disabled] &:hover {
      border-color: $input-disabled-border-color;
    }

    &:not([multiple]) {
      @include ltr-property("padding", 2.5em);
    }

    &[multiple] {
      height: auto;
      padding: 0;

      option {
        padding: 0.5em 1em;
      }
    }
  }

  // States
  &:not(.is-multiple):not(.is-loading):hover {
    &::after {
      border-color: $input-hover-color;
    }
  }

  // Colors
  @each $name, $pair in $select-colors {
    $color: nth($pair, 1);

    &.is-#{$name} {
      &:not(:hover)::after {
        border-color: $color;
      }

      select {
        border-color: $color;

        &:hover,
        &.is-hovered {
          border-color: bulmaDarken($color, 5%);
        }

        &:focus,
        &.is-focused,
        &:active,
        &.is-active {
          box-shadow: $input-focus-box-shadow-size bulmaRgba($color, 0.25);
        }
      }
    }
  }

  // Sizes
  &.is-small {
    @include control-small;
  }

  &.is-medium {
    @include control-medium;
  }

  &.is-large {
    @include control-large;
  }

  // Modifiers
  &.is-disabled {
    &::after {
      border-color: $input-disabled-color !important;
      opacity: 0.5;
    }
  }

  &.is-fullwidth {
    width: 100%;

    select {
      width: 100%;
    }
  }

  &.is-loading {
    &::after {
      @extend %loader;

      margin-top: 0;
      position: absolute;

      @include ltr-position(0.625em);

      top: 0.625em;
      transform: none;
    }

    &.is-small:after {
      font-size: $size-small;
    }

    &.is-medium:after {
      font-size: $size-medium;
    }

    &.is-large:after {
      font-size: $size-large;
    }
  }
}