Sharp-corner button

Sharp-corner buttons — those with a border radius of zero — give your designs a serious and sophisticated look. They look more solid and reliable than buttons with rounded corners.

According to the psychological Bouba/Kiki effect, over 95% of people associate edgy, jagged objects with words like "Kiki" that don't require a large opening of your lips. In contrast, words that people pronounce with widely open, rounded lips, like "Bouba," are associated with curve-outlined shapes.^[1] More importantly, sharp shapes feel more rigid and severe, while soft-edged shapes feel more friendly and easy-going.

Sharp-corner buttons may be a good solution for an insurance company website but could appear too harsh for a site selling blankets, clothing, and gifts for babies.