Nearly all motherboards come in standardized form factors. If you're just worried about getting one that fits your case, you could get any micro ATX motherboard. If you want one that's guaranteed to work with that CPU, get a B250 motherboard. e.g. https://www.newegg.com/Product/Product.aspx?Item=N82E16813130991&ignorebbr=1&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-PCPartPicker,%20LLC-_-na-_-na-_-na&cm_sp=&AID=10446076&PID=3938566&SID=