Ok, So the current colour is blue: #10a2ef Open file Microjobs/assets/css/style.css Run a search for 10a2ef and you could replace all with the colour of your choice.
For mobile you have to go to style.css in mobile folder.
This will change almost all the blue items to the colour you choose. There are few other lines that hold the shadow colour and gradient that you can also change. Remember to backup you style.css file in case you mess up.