saas-one/frontend/operation-web/overrides/grid/Panel.scss

.x-grid-empty {
    height: 90%;
    max-height: 300px;

    .x-grid-empty-img {
        height: 100%;
        max-height: 200px;
        background: url(get-resource-path('images/grid/empty.png')) no-repeat;
        background-position: center calc(100% - 8px);
    }
    
    .x-grid-empty-text {
        font-size: 14px;
        color: #BEBEBE;
        letter-spacing: 0;
        text-align: center;
        line-height: 26px;
    }
}