.corps {
    height: 80vh;
    display: block;
    position: relative;

}

.bg-passageOk
{
    background-color: seagreen;
}

.corps::after {
    content: "";
    background-repeat:no-repeat;
    background-position:center center;
    background-attachment:fixed;
    background-size: 50vh auto;
    background-image: url("../src/assets/logo.png");
    opacity: 0.5;
    top: 0;
    left: 0;
    bottom: 0;
    right: 0;
    position: absolute;
    z-index: -1;
}

.fade-enter-active{
    transition: opacity .5s;
}
.fade-enter /* .fade-leave-active below version 2.1.8 */ {
    opacity: 0;
}