section.duyuru {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;

    position: fixed;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 9999;
   animation: duyuruKapat 7s 0.5;
    visibility: hidden;

}

section.duyuru div {
  
    padding: 1em;
    text-align: center;
}

section.duyuru div img{
    
    max-width: 80%;
}
@keyframes duyuruKapat {
    0% {opacity: 1; visibility: visible;}
    80% {opacity: 1; visibility: visible;}
    100% {opacity: 0;visibility: hidden;}
}

section .duyuru a {
    position: absolute;
    background-color: black;
    color: white;
    padding: 0.5em;
}

section:target {
    animation: none;
    visibility: hidden;
}