Real mayo is often a pale yellow, unlike the stuff in the jars.
Love making homemade mayo, it's pretty quick and can alter the ingredients depending on the use. Lemon juice, lime juice, red wine/ apple cider vinegar, different oils/ add ins, mustards, and the list goes on and on..
If you want it to stay longer, can whisk in a couple TBSPs of boiling water at the end. This will pasteurize the eggs, and stays good in the fridge for quite some time.
100% olive oil mayo will often have a bitter aftertaste.. if that bothers you, use a more neutral oil like canola or vegetable, avocado is good too but pricey. Can also mix different kinds of oils to your hearts content, mine is usually 50/50ish canola & olive, I don't measure anything though so can't really tell you for sure lol.