RGBA color system is an extension of RGB with an extra parameter — an alpha channel that sets the opacity for a color. Alpha can vary from 0.0 (fully transparent) and 1.0 (not transparent at all). So, if we set the lowest value, the color will be fully transparent. If we change the Alpha parameter to 1, the color will appear solid and entirely opaque. The syntax for RGBA color model will vary only slightly: style="color:rgba(255, 99, 71, 0.5);".