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

.container {
    max-width: 1100px;
    min-height: 600px;
    text-align: center;
    background-color: rgb(227, 226, 226);
    margin: 100px auto;
    padding: 30px 30px;
}

.heading {
    margin-bottom: 20px;
}


.item-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(3, 200px);
    gap: 5px;
}


img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(40%);
}

.item {
    position: relative;
}

.item .number {
    position: absolute;
    color: white;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 1.5rem;
}

.item-1 {
    grid-row: span 2;
}

.item-2 {
    grid-column: span 2;
}

.item-4 {
    grid-row: span 2;
}

@media (max-width: 576px) {
    .item-grid {
        grid-template-columns: 1fr;
    }

    .item {
        grid-column: span 1;
        grid-row: span 1;
    }

    .container {
        margin: 50px 30px;
    }
}