Colors are important on your website. It depends on the goal of your site, but for most sites counts; choose one color palette and stick to that one. It creates harmony and consistency. Sites with to many colors are sometimes painful for the eyes and can let to the visitor taking your business less serious. Also choose colors that create good contrast with your background so everything is readable. Last but not least; choose your color palette wisely. It has to fit with your logo and other brand materials, so your visitor directly recognises your brand.