#slider li:nth-child(1){
    background: url("chockhold.png");
    background-size: 100% 100%;
}
#slider li:nth-child(2){
    background: url("tribrain.png");
    background-size: 100% 100%;
}
#slider li:nth-child(3){
    background: url("tablet.png");
    background-size: 100% 100%;
}
#slider li:nth-child(4){
    background: url("doctor.png");
    background-size: 100% 100%;
}
#slider li:nth-child(5){
    background: url("misodel.png");
    background-size: 100% 100%;
}
#slider li:nth-child(6){
    background: url("checkers.png");
    background-size: 100% 100%;
}
#slider li:nth-child(7){
    background: url("devil.png");
    background-size: 100% 100%;
}
#slider li:nth-child(8){
    background: url("freedom.png");
    background-size: 100% 100%;
}
#slider li:nth-child(9){
    background: url("cane.png");
    background-size: 100% 100%;
}
#slider li:nth-child(10){
    background: url("lungs.png");
    background-size: 100% 100%;
}
#slider li:nth-child(11){
    background: url("stare.png");
    background-size: 100% 100%;
}
#slider li:nth-child(12){
    background: url("roller.png");
    background-size: 100% 100%;
}
#slider li:nth-child(13){
    background: url("orange.png");
    background-size: 100% 100%;
}
#slider li:nth-child(14){
    background: url("sponge.png");
    background-size: 100% 100%;
}
#slider li:nth-child(15){
    background: url("cage.png");
    background-size: 100% 100%;
}
#slider li:nth-child(16){
    background: url("cactus.png");
    background-size: 100% 100%;
}
#slider li:nth-child(17){
    background: url("bee.png");
    background-size: 100% 100%;
}
#slider li:nth-child(18){
    background: url("burning.png");
    background-size: 100% 100%;
}