Анимированый линейный переход по клику

$("button").on("click", function(){ 
	$(".block").animate({background: "linear-gradient(to bottom, #4b5fff 60%, #ebebeb)"}, 1000); 
})

.block{ 
  width: 100px; 
  height: 100px; 
  border: 1px solid #000; 
  background: linear-gradient(to bottom, #0D343A 40%, #000);  
} 
button{ 
  margin-top: 20px; 
  width: 100px; 
  height: 20px; 
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
<script src="https://cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.min.js"></script> 
<div class="block"></div> 
<button></button>