improve(license-warning): moved styles to a stylesheet
improve(license-warning): moved styles to a stylesheet

Related to CAM-6963

xlinur/camunda-bpm-webapp,xlinur/camunda-bpm-webapp,TitanUser/camunda-bpm-webapp,TitanUser/camunda-bpm-webapp,xlinur/camunda-bpm-webapp,TitanUser/camunda-bpm-webapp