You just add this under the first code:


$('input').click(function(){
var ourText = $('p');
var currLineHeight = ourText.css('lineHeight');
var finalNum = parseFloat(currLineHeight, 10);
var stringEnding = currLineHeight.slice(-2);
if(this.id == 'large') {
finalNum *= 1.2;
}
else if (this.id == 'small'){
finalNum /=1.2;
}
ourText.animate({lineHeight: finalNum + stringEnding},300);
});
});