Updates font size of input text to make it fit the entire field instead of overflowing. May need some tweaking to be entirely portable.

text-input-handler.js

$('input[type="text"]').bind("propertychange keyup input paste", function(event){
  
    var len = $(this).val().length;
    if (len >= 13){
        
        letters = len - 13;
        percentage = letters/34;
        
        fontsize = Math.round(57-45*percentage);
        
        console.log(fontsize);
        console.log(len);
        
        if (fontsize < 18) fontsize = 18;
        
        $('.subscribeInput').css('font-size',fontsize+"px")
    } else {
        $('.subscribeInput').css('font-size','57px');
    }
});