MyJavawebProject/WebContent/scss/bootstrap/mixins/_forms.scss

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// Form control focus state
//
// Generate a customized focus state and for any input with the specified color,
// which defaults to the `$input-focus-border-color` variable.
//
// We highly encourage you to not customize the default value, but instead use
// this to tweak colors on an as-needed basis. This aesthetic change is based on
// WebKit's default styles, but applicable to a wider range of browsers. Its
// usability and accessibility should be taken into account with any change.
//
// Example usage: change the default blue border and shadow to white for better
// contrast against a dark gray background.
@mixin form-control-focus() {
  &:focus {
    color: $input-focus-color;
    background-color: $input-focus-bg;
    border-color: $input-focus-border-color;
    outline: 0;
    // Avoid using mixin so we can pass custom focus shadow properly
    @if $enable-shadows {
      box-shadow: $input-box-shadow, $input-focus-box-shadow;
    } @else {
      box-shadow: $input-focus-box-shadow;
    }
  }
}


@mixin form-validation-state($state, $color) {
  .#{$state}-feedback {
    display: none;
    width: 100%;
    margin-top: $form-feedback-margin-top;
    font-size: $form-feedback-font-size;
    color: $color;
  }

  .#{$state}-tooltip {
    position: absolute;
    top: 100%;
    z-index: 5;
    display: none;
    max-width: 100%; // Contain to parent when possible
    padding: .5rem;
    margin-top: .1rem;
    font-size: .875rem;
    line-height: 1;
    color: #fff;
    background-color: rgba($color, .8);
    border-radius: .2rem;
  }

  .form-control,
  .custom-select {
    .was-validated &:#{$state},
    &.is-#{$state} {
      border-color: $color;

      &:focus {
        border-color: $color;