model_field_selector.less

.o_field_selector {
    position: relative;

    > .o_field_selector_value {
        .o-flex-display();
        .o-flex-flow(row, wrap);
        .o-align-items(center);
        height: 100%;
        min-height: 20px; // needed when there is no value in it and used standalone

        &:active, &:focus, &:active:focus {
            outline: none;
        }

        > .o_field_selector_chain_part {
            padding: 0px 1px;
            border: 1px solid @gray-lighter-darker;
            background: @gray-lighter-dark;
            margin-bottom: 1px;
        }
        > i {
            .o-align-self(center);
            margin: 0 2px;
            font-size: 10px;
        }
    }
    > .o_field_selector_controls {
        .o-position-absolute(0, 0, 1px);
        .o-flex-display();
        .o-align-items(center);
        cursor: pointer;
    }

    &.o_edit_mode {
        > .o_field_selector_controls::after {
            .o-caret-down();
        }

        > .o_field_selector_popover {
            @o-field-selector-arrow-height: 7px;
            .o-position-absolute(@top: 100%, @left: 0);
            z-index: 1051;
            width: 265px;
            margin-top: @o-field-selector-arrow-height;
            background: white;
            box-shadow: 0 3px 10px rgba(0,0,0,.4);

            &:focus {
                outline: none;
            }

            .o_field_selector_popover_header {
                color: white;
                background: @brand-primary;
                font-weight: bold;
                padding: 5px 0 5px 0.4em;

                .o_field_selector_title {
                    width: 100%;
                    .o-text-overflow();
                    padding: 0px 35px;
                    text-align: center;
                }
                .o_field_selector_popover_option {
                    .o-position-absolute(@top: 0);
                    padding: 7px 8px 8px 6px;

                    &.o_prev_page {
                        left: 0;
                        border-right: 1px solid darken(@brand-primary, 10%);
                    }
                    &.o_field_selector_close {
                        right: 0;
                        border-left: 1px solid darken(@brand-primary, 10%);
                    }
                    &:hover {
                        background: darken(@brand-primary, 10%);
                    }
                }
                &:before {
                    .o-position-absolute(@top: -@o-field-selector-arrow-height, @left: @o-field-selector-arrow-height);
                    content: "";
                    border-left: @o-field-selector-arrow-height solid rgba(0, 0, 0, 0);
                    border-right: @o-field-selector-arrow-height solid rgba(0, 0, 0, 0);
                    border-bottom: @o-field-selector-arrow-height solid @brand-primary;
                }
            }
            .o_field_selector_popover_body {
                .o_field_selector_page {
                    position: relative;
                    max-height: 320px;
                    overflow: auto;
                    margin: 0;
                    padding: 0;

                    > .o_field_selector_item {
                        @mfs-next-page-padding: 15px;

                        list-style: none;
                        position: relative;
                        padding: 5px 0 5px 0.4em;
                        cursor: pointer;
                        border-bottom: 1px solid @gray-lighter-dark;

                        &.o_has_relation {
                            padding-right: @mfs-next-page-padding * 3;
                        }
                        &.active {
                            background: @gray-lighter-darker;
                        }

                        > .o_field_selector_item_title {
                            font-size: 0.85em;
                        }
                        > .o_field_selector_next_page {
                            .o-position-absolute(@top: 0, @right: 0, @bottom: 0);
                            .o-flex-display();
                            .o-align-items(center);
                            border-left: 1px solid @gray-lighter-darker;
                            padding: 0 @mfs-next-page-padding;
                            background: white;

                            &:hover {
                                background: darken(@gray-lighter-darker, 10%);
                            }
                        }
                    }
                }
            }
            .o_field_selector_popover_footer {
                background: @brand-primary;
                padding: 5px 0.4em;

                > input {
                    width: 100%;
                }
            }
        }
    }
}