/*
.resource-wood {
    background: url("../img/resource_wood.png") 50% no-repeat;
}
.resource-stone {
    background: url("../img/resource_stone.png") 50% no-repeat;
}
.resource-gas {
    background: url("../img/resource_gas.png") 50% no-repeat;
}
.resource-oil {
    background: url("../img/resource_oil.png") 50% no-repeat;
}
*/