.img_1 {
position: absolute;
left: 0px;
top: 0px;
}

.img_2 {
position: absolute;
left: 255px;
top: 0px;
}

.img_3 {
position: absolute;
left: 85px;
top: 63px;
}

.img_4 {
position: absolute;
left: 170px;
top: 63px;
}

.img_5 {
position: absolute;
left: 255px;
top: 63px;
}

.img_6 {
position: absolute;
left: 340px;
top: 63px;
}

.img_7 {
position: absolute;
left: 0px;
top: 126px;
}

.img_8 {
position: absolute;
left: 85px;
top: 126px;
}

.img_9 {
position: absolute;
left: 255px;
top: 126px;
}

.img_10 {
position: absolute;
left: 340px;
top: 189px;
}

.img_11 {
position: absolute;
left: 255px;
top: 252px;
}