app/node_modules/@angular/material/datepicker/_datepicker-legacy-compat.scss

@use '../button/button-theme';
@use '../button/icon-button-theme';

@mixin legacy-button-compat-theme($theme) {
  .mat-datepicker-content {
    @include button-theme.theme($theme);
    @include icon-button-theme.theme($theme);
  }
}

@mixin legacy-button-compat() {
  .mat-datepicker-toggle .mat-mdc-button-base {
    width: 40px;
    height: 40px;
    padding: 8px 0;
  }

  .mat-datepicker-actions {
    $spacing: 8px;

    .mat-button-base + .mat-button-base {
      margin-left: $spacing;

      [dir='rtl'] & {
        margin-left: 0;
        margin-right: $spacing;
      }
    }
  }
}

@mixin legacy-form-field-compat() {
  .mat-form-field {
    .mat-form-field-prefix,
    .mat-form-field-suffix {
      .mat-datepicker-toggle .mat-mdc-button-base {
        width: 40px;
        height: 40px;
        padding: 8px 0;
      }
    }

    .mat-datepicker-toggle .mat-mdc-icon-button .mat-icon {
      font-size: 1em;
      display: inline-block;
      margin: -2px 0 1px;
    }
  }

  .mat-form-field-type-mat-date-range-input .mat-form-field-infix {
    // Bump the default width slightly since it's somewhat cramped with two inputs and a separator.
    width: 200px;
  }

  .mat-form-field-appearance-legacy {
    .mat-form-field-prefix,
    .mat-form-field-suffix {
      .mat-datepicker-toggle .mat-mdc-icon-button {
        font-size: inherit;
        width: 1.5em;
        height: 1.5em;
        padding: 0;
      }

      .mat-datepicker-toggle-default-icon {
        width: 1em;
      }

      .mat-datepicker-toggle .mat-mdc-icon-button .mat-icon {
        line-height: 1.5em;
        margin: 0;
      }
    }
  }

  .mat-form-field {
    .mat-datepicker-toggle .mat-mdc-button-base {
      vertical-align: middle;
    }

    &:not(.mat-form-field-appearance-legacy) .mat-datepicker-toggle .mat-mdc-button-base {
      vertical-align: baseline;
    }
  }
}