background-image does not show

    <section class="hero">
       <header>
        <div class="header_logo">
            <div class="header_logo__logo-box">
       </header>
   </section>

.hero {
background-image: url(/img/background.jpg);
min-height: 80vh;
background-position: center;
background-repeat: no-repeat;
background-size: cover;
padding-top: 30px;

}

https://ibb.co/7kB17R9

Background-image does not show. Tried:

background: url(/img/background.jpg) 
background: url(\img/background.jpg)
background: url(\img\background.jpg) 
background: url(img/background.jpg) 
background: url(img\background.jpg)

same with background-image and change slash direction, same also when use other images, same also even move picture to main or other folder same also with other types off images