I would suggest to use another notation:
{% if ... %}
border-color: lime;
{% else %}
border-color: orange;
{% endif %}
More structural imho, also can be easily changed to
{% if ... %}
border-color: lime;
smth_else: bla-bla;
{% else %}
border-color: orange;
smth_else: bla-bla-bla;
{% endif %}
no to mention a possible indentation:
{% if ... %}
border-color: lime;
{% else %}
border-color: orange;
{% endif %}