style.css

* {
  box-sizing: border-box;
}

.container {
    width: 100%;
    height: 700px;
    border: 5px solid saddlebrown;
    margin: 15px auto;
    background-image: url("background.png");
    background-size: cover;
    box-shadow: 3px 3px 10px gray;
    display: grid;
    grid-template-columns: repeat(3, 33.333%);
    grid-template-rows: repeat(8, 1fr);
    grid-template-areas:
    "door9 door6 door11"
    "door19 door2 door7"
    "door3 door20 door16 "
    "door14 door12  door15"
    "door1 door5 door23"
    "door22 door10 door24"
    "door17 door21 door4"
    "door8 door18 door13";
}

.image {
    background-size: cover;
    background-position: center;
}

.text {
    height: 100%;
    width: 100%;
    color: black;
    padding: 10px;
    border: 1px solid saddlebrown;
    transition: opacity 2.5s;
}

@media only screen and (min-width: 768px) {

    .container {
        width: 800px;
        height: 900px;
        margin: 15px auto;
        background-size: cover;
        box-shadow: 6px 6px 20px gray;
        display: grid;
        grid-template-columns: repeat(4, 25%);
        grid-template-rows: repeat(6, 1fr);
        grid-template-areas:
        "door9 door6 door11 door7"
        "door3 door20 door16 door2"
        "door14 door12 door19 door15"
        "door22 door1 door5 door23"
        "door17 door10 door24 door21"
        "door8 door18 door4 door13";
    }

    .image {
        background-image: none;
        background-size: cover;
        background-position: center;
    }

    .text {
        height: 100%;
        width: 100%;
        padding: 10px;
        border: 2px solid saddlebrown;
    }
}