Q:

Circle follow cursor after hover on button

I'm trying to remake hover like on this website: 
https://www.samsaraubud.com/
When you hover over a button (and only button. I don't want circle over whole website), a circle appers around cursor. I tried so many solutions from codepen after typing "mouse follow" but nothing works.
I have button like this: 
https://codepen.io/Aventadorrre/pen/mdyPJbv 

body {
  padding: 100px;
  margin: auto;
}

a {
  color: red;
  border: 2px solid red;
  padding: 20px 50px;
}
<a href="#">Button</a>

and how to make circle around mouse (following mouse) when i hover button?

A:

Consider a radial-gradient as background that you make fixed then simply adjust the position based on the cursor

var h =document.querySelector('.cursor');

document.body.onmousemove = function(e) {
  /* 15 = background-size/2 */
  h.style.setProperty('background-position',(e.clientX - 15)+'px '+(e.clientY - 15)+'px');
}
body {
  padding: 100px 0;
}

a.cursor {
  color: red;
  border: 2px solid red;
  padding: 20px 50px;
  background:
    radial-gradient(farthest-side, 
     transparent calc(100% - 3px),
     red calc(100% - 2px) calc(100% - 1px),
     transparent 100%) 
     fixed /* Fixed to the screen*/ 
     no-repeat; /* Don't repeat*/

  background-size:30px 30px; /* Control the size of the circle */
  
}
<a class="cursor" href="#">Button</a>

If you want the circle above the text consider pseudo element and the same trick:

var h =document.querySelector('.cursor');

document.body.onmousemove = function(e) {
  h.style.setProperty('background-position',(e.clientX - 15)+'px '+(e.clientY - 15)+'px');
}
body {
  padding: 100px 0;
}

a.cursor {
  color: red;
  border: 2px solid red;
  padding: 20px 50px;
  background-size:0 0; 
  position:relative;
}
a.cursor::after {
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  bottom:0;
  background:
    radial-gradient(farthest-side, 
     blue  calc(100% - 1px),
     transparent 100%) 
     fixed /* Fixed to the screen*/ 
     no-repeat; /* Don't repeat*/
  background-size:30px 30px;
  background-position:inherit;
}
<a class="cursor" href="#">Button</a>

