.carousel-container {
    perspective: 2500px;
    transform-style: preserve-3d;
    width: 100%;
    height: 300px; 
    position: relative;
    overflow: hidden;
}

.firstone, .secondone, .treeone, .lastone {
    position: absolute;
    top: 50%;
    left: 50%;
    transform-origin: center center;
    backface-visibility: hidden;
}