* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    height: 100vh;
    background-color: white;
}

.container {
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    filter: drop-shadow(-8px 16px 6px rgba(0, 0, 0, 0.3));
}

.box {
    width: 612px;
    height: 529.8px;
    background-color: #333;
    position: relative;
    clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
}

.box::after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 608px;
    height: 525.8px;
    background-color: white;
    clip-path: polygon(25% 0%, 75% 0%, 100% 50%, 75% 100%, 25% 100%, 0% 50%);
}