Design your application and use some colors that aren't weird or boring.
Use a tool called Material Palette and pick 2 colors and you will get a resulting palette. You can click to download and then select "CSS" and you will get a file that looks like this:
/* Palette generated by Material Palette - materialpalette.com/brown/teal */
Challenge 1: Switch up the colors!
.dark-primary-color { background: #5D4037; } .default-primary-color { background: #795548; } .light-primary-color { background: #D7CCC8; } .text-primary-color { color: #FFFFFF; } .accent-color { background: #009688; } .primary-text-color { color: #212121; } .secondary-text-color { color: #757575; } .divider-color { border-color: #BDBDBD; }