.dev-state{
    background-size: 100% 100%;
    display: inline-block;
    width: 40px;
    height: 40px;
    &.dev-s{
        background-image: url('../images/dev/dev-s.png');
    }
    &.dev-w{
        background-image: url('../images/dev/dev-w.png');
    }
    &.dev-e{
        background-image: url('../images/dev/dev-e.png');
    }
}