.my-test-background-1 {
    width: 500px;
    height: 500px;
    margin-left: auto;
    margin-right: auto;
    background-image: url("https://new.rocketlabsqa.ovh/wp-content/rocket-test-data/images/mountain.webp");
    }.my-test-background-3 {
        width: 500px;
        height: 500px;
        margin-left: auto;
        margin-right: auto;
        background-image: url("/wp-content/rocket-test-data/images/painting-mountain-lake.avif");
        }

#dynamic_style{
    
    width: 100%;
    height: 400px;
    background-image: url("https://new.rocketlabsqa.ovh/wp-content/rocket-test-data/images/flowers.jpg");

}

#dynamic_style{
            
            background: url('/wp-content/rocket-test-data/images/test_internal4.jpg');
        }