To provide visually-impaired persons information of low-vision care from a website of medical institution without assistive technologies for disabilities, the authors developed a test production of Medical Institution Webpage with a responsive web design (flexbox). In browsing both by a smartphone and PC, it is possible to see extremely expanded characters such as 50pt or 100pt, which many medical institutions website cannot be shown by usual settings of web browser. Such a design is more than satisfied with level AA requirements of Web Accessibility Contents Guidelines by W3C, but can easily be made with reasonable cost.