body {
    background-color: #dcdcdc;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}
.outer-rectangle {
    width: 300px;
    height: 400px;
    background-color: #ffffff;
    position: relative;
    border: 2px solid #000000;
}
.inner-rectangle-1 {
    width: 100px;
    height: 200px;
    background-color: #cde4ee;
    position: absolute;
    top: 50px;
    left: 50px;
}
.inner-rectangle-2 {
    width: 50px;
    height: 100px;
    background-color: black;
    position: absolute;
    top: 100px;
    left: 100px;
}

.inner-rectangle-3 {
    width: 25px;
    height: 25px;
    background-color: red;
    position: absolute;
    top: 225px;
    left: 200px;
}
.inner-rectangle-4 {
    width: 50px;
    height: 25px;
    background-color: yellow;
    position: absolute;
    top: 225px;
    left: 150px;
}
.inner-rectangle-5 {
    width: 100px;
    height: 35px;
    background-color: rgb(163, 163, 159);
    position: absolute;
    top: 215px;
    left: 50px;
}