Color codes temperature

colorCodeTemperature.js

function temp( temperature, element ){
     var norm = function(x){ return x - 10; },
         cold = function(x){ 
             return 'rgba(0, 131, 253,'+ Math.abs(norm(x) / 25) + ')';
         },
         warm = function(x){ 
             return 'rgba(253,'+ Math.floor((200 - x*3)) +',0,'+ norm(x)/15 + ')'; 
         };
    
    if( temperature >= 10 ){
        element.style.backgroundColor = warm(temperature);
    } else {
        element.style.backgroundColor = cold(temperature);
    }
}