How to remove Placeholder or hide it when using Background Images?

When I add a Section to a page I see the placeholder block. When I then add a background image to the Section the placeholder still appears. How can I remove the placeholder function or use a background image with a Section?

Screen Shot 2019-05-29 at 5.13.16 AM.jpg2874×1644 729 KB

<section style="" id="HeroSection" class="style1"></section>

.style1 {
    background-image: url("assets/5c65b5e3f2c5405719d68939_61903.jpeg");
    background-size: cover;
    background-position: center center;
    background-repeat: no-repeat;
    min-height: 600px
}