JSFiddle - React, Tailwind, and code Playground

by Alexandru Gatea

HTML

<img src="https://souvenirs.vincent.voyage/wp-content/uploads/IllustrationsArticles/Norvege/DSC07914.jpg" alt="">

<div class="glare one"></div>
<div class="glare two"></div>

CSS

body {
	margin:0;
	overflow: hidden;
}
img {
	width: 100%;
}

.glare {
	position: absolute;
	width: 400px;
	height: 400px;
	background: #98ea5f;
	mix-blend-mode: plus-lighter;
	opacity: 0.2;
	filter: blur(56px);
	border-radius: 50%;
}

.glare.one {
		animation: anim 6s infinite cubic-bezier(.33,-0.06,.19,.22);
}

.glare.two {
	animation: anim2 8s infinite cubic-bezier(.33,-0.06,.19,.22);
}



@keyframes anim {
	 0% { top: -10%; left: 95%; opacity: 0.0 }
	10% { top: 10%;  left: 75%; opacity: 0.2;}
	30% { top: 25%;  left: 60%; opacity: 0.08;}
 40%, 100% { top: 45%;  left: 65%; opacity: 0.0 }
}

@keyframes anim2 {
	 0% { top: 10%;  left: 10%; opacity: 0.0 }
	5% { top: 10%;  left: 40%; opacity: 0.05;}
	20% { top: 30%;  left: 30%; opacity: 0.2;}
 40%, 100% { top: 40%;  left: 50%; opacity: 0.0 }
}

JavaScript

dragElement(document.getElementById("drag"));

function dragElement(elmnt) {
  var pos1 = 0, pos2 = 0, pos3 = 0, pos4 = 0;
  if (document.getElementById(elmnt.id + "header")) {
    // if present, the header is where you move the DIV from:
    document.getElementById(elmnt.id + "header").onmousedown = dragMouseDown;
  } else {
    // otherwise, move the DIV from anywhere inside the DIV:
    elmnt.onmousedown = dragMouseDown;
  }

  function dragMouseDown(e) {
    e = e || window.event;
    e.preventDefault();
    // get the mouse cursor position at startup:
    pos3 = e.clientX;
    pos4 = e.clientY;
    document.onmouseup = closeDragElement;
    // call a function whenever the cursor moves:
    document.onmousemove = elementDrag;
  }

  function elementDrag(e) {
    e = e || window.event;
    e.preventDefault();
    // calculate the new cursor position:
    pos1 = pos3 - e.clientX;
    pos2 = pos4 - e.clientY;
    pos3 = e.clientX;
    pos4 = e.clientY;
    // set the element's new position:
    elmnt.style.top = (elmnt.offsetTop - pos2) + "px";
    elmnt.style.left = (elmnt.offsetLeft - pos1) + "px";
  }

  function closeDragElement() {
    // stop moving when mouse button is released:
    document.onmouseup = null;
    document.onmousemove = null;
  }
}