Serious caucasian adolescent sitting on sofa and holding smartphone in his hands at cozy home. Sad boy talking on video call or webinar with friends on mobile phone. Thoughtful child using smartphone listening music and watching video blog films cartoons on internet. Kid using technology. Screen time addiction. New generation z. Concept of e-learning learning online homeschool virtual school education studying. Child resting relaxing looking at screen of gadget indoors. High technology. mobile devices