web/index: Fix activities on homepage on mobile devices
web/index: Fix activities on homepage on mobile devices

laurenor/SchoolIdolAPI,rdsathene/SchoolIdolAPI,laurenor/SchoolIdolAPI,rdsathene/SchoolIdolAPI,SchoolIdolTomodachi/SchoolIdolAPI,laurenor/SchoolIdolAPI,rdsathene/SchoolIdolAPI,SchoolIdolTomodachi/SchoolIdolAPI,dburr/SchoolIdolAPI,dburr/SchoolIdolAPI,dburr/SchoolIdolAPI,SchoolIdolTomodachi/SchoolIdolAPI