@charset "utf-8";
.shutter {
    position: fixed;
    top: 0;
    left: 0;
    width: 200vw;
    height: 100vh;
    background-color: #F0C010;
    z-index: 99;
    pointer-events: none;
    transition: transform .8s ease-in-out;
}

.shutter-a {
    transform: translateX(100vw);
}
.shutter-a.moved {
    transform: translateX(-200vw);
}

.shutter-b {
    transform: translateX(-200vw);
}
.shutter-b.moved {
    transform: translateX(100vw);
}