behavior of the custom css

PHP Version : 5.5.33

MySQL Version : 5.6.29-76.2-log

Server Information : Linux webxc213s03.ad.aruba.it 3.10.0-327.10.1.el7.x86_64 #1 SMP Tue Feb 16 17:03:50 UTC 2016 x86_64

Fix jQuery? : Yes

Load JEvents Bootstrap CSS? : Yes

Max Input Vars ? : 1000

Club code set? : No  

User Agent : Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.87 Safari/537.36  

Joomla : 3.4.8

component_com_jevents : 3.4.8

component_com_jce : 2.5.15

module_mod_jevents_cal : 3.4.8

module_mod_jevents_custom : 3.4.8

module_mod_jevents_filter : 3.4.8

module_mod_jevents_latest : 3.4.8

module_mod_jevents_legend : 3.4.8

module_mod_jevents_switchview : 3.4.8

plugin_content_jevents : 3.4.8

plugin_finder_jevents : 3.4.8

plugin_search_eventsearch : 3.4.8

plugin_system_gwejson : 3.4.8

I customized the CSS mini calendar with jevcustom (i'm using "flat" theme).
what happens is that I see my personal style in minicalendar only when I visit the month page; when i visit other pages (year, day, etc.) I see the default style.
Inspecting the code I see this behavior, the custom style appears after the default, in second position and barred, for example:
modstyle.css
#flatcal_minical .flatcal_navbar
{background-color: #f7f7f7;
}
jcustom.css
#flatcal_minical .flatcal_navbar
{background-color: #d8edf3;
}

thank you for the help...