*, html, body {
                margin: 0 auto; padding: 0;
                scroll-snap-type: x mandatory;
            }
        
            .scroll-snap_slider {
                display: flex;
                overflow-x: scroll; overflow-y: hidden;
                -webkit-overflow-scrolling: touch;
            }
            
            div {
                position: relative;
                height: 100vh;
                width: 100vw; min-width: 100vw; /* [전체화면 수직 스크롤스냅]과는 달리, 반드시 min-width 값도 추가해주어야 한다! */
                scroll-snap-align: start;
                text-align: center;
            }
            
            h1 {
                position: absolute; top: 50%;
                width: 100%;
                text-align: center;
                transform: translateY(-50%);
            }