.section2{
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    height: 30vh;
    background-image: linear-gradient(to top, #ffffff 0%, #ffffff 100%);
    overflow: hidden;
}

.section2_shell{
    position: relative;
    width: 60vw;/*vm means relative to the viewport width */
    height: 40vw;
    max-width: 38vh;
    max-height: 25vh;
    margin: 0;
    color: #ffffff;
    perspective: 120vh;
    transform-origin: center;
}

.section2_content{
    display: flex;
    justify-content: center;
    align-items: center;
    position: absolute;
    width: 100%;
    height: 100%;
    transform-origin: center;
    transform-style: preserve-3d;
    transform: translateZ(-30vw) rotateY(0);
    animation: carousel 30s infinite cubic-bezier(0.77, 0, 0.175, 1) forwards;
}

.section2_content:hover{
    animation-play-state: paused;
}

.section2_items{
    position: absolute;
    width: 60vw;
    height: 40vw;
    /* max-width: 38vh; */
    max-width: 19vw;
    /* max-height: 25vh; */
    max-height: 13vw;
    box-shadow: 0 5px 2vh rgba(0,0,0,0.3);
    border-radius: 6px;
    background-size: cover;
    -webkit-box-reflect: below 25px -webkit-linear-gradient(transparent 50%, rgba(255,255,255,0.3));
    cursor: pointer;
    transform-origin: center center;
}

.section2_items a{
    display: block;
    width: 100%;
    height: 100%;
    text-decoration: none;
    color: #ffffff;
}


.section2_items:nth-child(1) { --rotate: 0deg;   --bg-image: url(../pic/data/p1/1.jpg);}
.section2_items:nth-child(2) { --rotate: 72deg;  --bg-image: url(../pic/data/p2/1.jpg);}
.section2_items:nth-child(3) { --rotate: 144deg; --bg-image: url(../pic/data/p3/1.jpg);}
.section2_items:nth-child(4) { --rotate: 216deg; --bg-image: url(../pic/data/p4/1.jpg);}
.section2_items:nth-child(5) { --rotate: 288deg; --bg-image: url(../pic/data/p5/1.jpg);}

.section2_items:nth-child(1),
.section2_items:nth-child(2),
.section2_items:nth-child(3),
.section2_items:nth-child(4),
.section2_items:nth-child(5) {
    background-image: var(--bg-image);
    transform:scale3d(1, 1, 1) rotateY(var(--rotate)) translateZ(30vw);
}
.section2_items:nth-child(1):hover,
.section2_items:nth-child(2):hover,
.section2_items:nth-child(3):hover,
.section2_items:nth-child(4):hover,
.section2_items:nth-child(5):hover {
    transform: scale3d(1.1, 1.1, 1.1)
    rotateY(var(--rotate)) translateZ(30vw);
    box-shadow: 3vh 3vh 2vh rgba(0,0,0,0.5);
}




@keyframes carousel{
    0%{
        transform: translateZ(-30vw) rotateY(0);
    }
    20%{
        transform: translateZ(-30vw) rotateY(72deg);
    }
    40%{
        transform: translateZ(-30vw) rotateY(144deg);
    }
    60%{
        transform: translateZ(-30vw) rotateY(216deg);
    }
    80%{
        transform: translateZ(-30vw) rotateY(288deg);
    }
    100%{
        transform: translateZ(-30vw) rotateY(360deg);
    }
}