Because they're slightly elastic, plastic bolts sometimes allow the toilet seat to slide from side to side. To prevent
this, some manufacturers add a plastic sleeve to the seat hinge. Others include a piece of adhesive foam that you can place under the hinge. If your new toilet seat has plastic bolts but doesn't include these improvements,
buy a roll of two-sided carpet tape and stick a small piece to the underside of each hinge.
Looking for an unusual color? Several online retailers offer sample books containing 94 toilet seat colors. For about $50, you get the book and a new seat. Just type “ “Bemis color direct toilet seat”” into a search engine and you'll find several sources.