Did you know you can add your custom css file in
templates/cassiopeia_extended/html/com_jevents/flat/assets/css/events_css.css
Or override specific parts by using this type of content for this file
@import url("../../../../../../../components/com_jevents/views/flat/assets/css/events_css.css");
.jev_toprow div.previousmonth, .jev_toprow div.currentmonth, .jev_toprow div.nextmonth {
float: left;
height: 23px;
line-height: 23px;
text-align: center !important;
color: #606F79 !important;
font-weight: bold;
}
Media files can't be easily overriden
You can also use the Jevents custom css file and use this to override the CSS you don't like in the original source