/* !!! */
/* 使用 sticky 時，父層容器如果有使用 overflow 的 hidden,scroll,auto,或 overlay 等屬性值，都會阻礙 sticky 效果 */
/* !!! */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

section {
    position: relative;
    width: 100%;
    height: 250vh;
}

.screen {
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

.bulletin {
    background-color: black;
}

.slide-area {
    position: relative;
    left: -100%;
    display: flex;
    justify-content: space-evenly;
    width: 100%;
    padding: 20px;
    opacity: 0;
}

.fade-area {
    display: flex;
    justify-content: space-evenly;
    width: 100%;
    padding: 20px;
}
.fade-area .card {
    transform-style: preserve-3d;
    opacity: 0;
}

.card {
    height: 200px;
    width: 150px;
    background-color: white;
}