Media library all grey but images working

i just woke up that all featured images on my website is not showing up, and images on media library is not showing up too, they are just grey file icon like this. https://i.imgur.com/eMsHRC4.jpg i haven’t changed anything, but when i try to open the image via url it’s working https://makianime.com/wp-content/uploads/2016/07/Danganronpa-3-The-End-of-Kibougamine-Gakuen-Zetsubou-hen.jpg can u guys help me. i also searched before posting this, and tried their solution but not working.