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<!DOCTYPE html>
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $(".btn1").click(function(){
    $("#p1").animate({minHeight: "+=100px"});
  });
  $(".btn2").click(function(){
    $("#p1").animate({minHeight: "-=100px"});
  });
});
</script>
</head>
<body>
<button class="btn1">Animate +</button>
<button class="btn2">Animate -</button>
<p>This is a paragraph.</p>
<p id="p1" style="border:1px solid blue;;min-height:100px;">This is an animated paragraph.</p>
<p>This is a paragraph.</p>
</body>
</html>