.grid {
    width : 400px;
    height : 600px;
    background-image: url(img/bg.jpg);
    position: relative;
    margin: auto;
}

.jumper {
    width : 60px;
    height: 80px;
    background-image: url(img/Jumper_front.png);
    background-size: cover;
    position: absolute;
}

.platform {
    width : 85px;
    height : 15px;
    background-image: url(img/Brown\ Off.png);
    background-size: cover;
    position: absolute;
}