Separate declarations by new lines.
```
.treegrid-indent {
    width:16px; 
    height: 16px; 
    display: inline-block; 
    position: relative;
}

.treegrid-expander {
    width:16px; 
    height: 16px; 
    display: inline-block; 
    position: relative; 
    cursor: pointer;
}

.treegrid-expander-expanded{
    background-image: url(../img/collapse.png); 
}

.treegrid-expander-collapsed{
    background-image: url(../img/expand.png);
}
```