    .#{$prefix}grid-header-ct {
        border: $grid-header-border-width $grid-header-border-style $panel-body-border-color;

        // Body border provided by headerCt only when in accordion layout.
        border-bottom-color: $grid-header-background-color;

        background-color: $grid-header-background-color;
        @if not is-null($grid-header-background-gradient) {
            @include background-gradient($grid-header-background-color, $grid-header-background-gradient);
        }
    }

    @if $include-ext-layout-container-accordion {
        .#{$prefix}accordion-item .#{$prefix}grid-header-ct {
            border-width: 0 0 $grid-header-border-width !important;
        }

        // When hideHeaders: true, we need !important to override above rule
        .#{$prefix}accordion-item .#{$prefix}grid-header-ct-hidden {
            border: 0 !important;
        }
    }

    // create the bottom border of the header container by adding a top border to the
    // grid body.  This is necessary because the header container is a docked item, and
    // Dock layout's border-collapsing mechanism removes the bottom border of top docked
    // items with a !important.
    .#{$prefix}grid-body {
        border-top-color: $grid-header-border-color;
    }

    .#{$prefix}hmenu-sort-asc {
        background-image: theme-background-image('grid/hmenu-asc');
    }

    .#{$prefix}hmenu-sort-desc {
        background-image: theme-background-image('grid/hmenu-desc');
    }

    .#{$prefix}cols-icon {
        background-image: theme-background-image('grid/columns');
    }