background-image , url 앞에 넣어주기
background-image: linear-gradient(0deg, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('https://movie-phinf.pstatic.net/20210715_95/1626338192428gTnJl_JPEG/movie_image.jpg');
background-position: center;
background-size: cover;
linear-gradient(0deg, rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5))
