.buttonsContainer{
    position:absolute;
}
.buttonsContainer .button {
background-color:#A6B7D4;
cursor:pointer;
float:left;
font-size:6px;
padding:1px 4px;
margin-right:2px;
}
.buttonsContainer .buttonSelected {
background-color:#004FA2;
color:white;
}

.buttonsContainer .button1 span
,.buttonsContainer .button2 span
,.buttonsContainer .button3 span
,.buttonsContainer .button4 span
{display:none;}

.buttonsContainer .button1{font-size:1px;padding:0;width:12px;height:12px;background:url(numeros/numero_1.png) transparent;}
.buttonsContainer .button2{font-size:1px;padding:0;width:12px;height:12px;background:url(numeros/numero_2.png) transparent;}
.buttonsContainer .button3{font-size:1px;padding:0;width:12px;height:12px;background:url(numeros/numero_3.png) transparent;}
.buttonsContainer .button4{font-size:1px;padding:0;width:12px;height:12px;background:url(numeros/numero_4.png) transparent;}

.buttonsContainer .buttonSelected1{background-image:url(numeros/numero_1_on.png);}
.buttonsContainer .buttonSelected2{background-image:url(numeros/numero_2_on.png);}
.buttonsContainer .buttonSelected3{background-image:url(numeros/numero_3_on.png);}
.buttonsContainer .buttonSelected4{background-image:url(numeros/numero_4_on.png);}