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Here you can Sed posuere consectetur est at lobortis. Donec ullamcorper nulla non metus auctor fringilla. Maecenas sed diam eget risus varius blandit sit amet non magna. Donec id elit non mi porta gravida at eget metus. Praesent commodo cursus magna, vel scelerisque nisl consectetur et.

HTML

            
              <button class="btn" type="button">Button</button>

<!--
And when i'm done coding this...
--second structure--
(if javascript is off or the browser did not support css filter:blur)
<button class="btn-fallback btn-fluent">Text</button

(if javascript is on and browser did support css filter:blur)
<button class="btn-fluent">
<text/> z-index: 1;
<circle1/> width&height: height->btn-fluent + [num]em; z-index: 2;
<circle2/> width&height: height->btn-fluent + [num]em; z-index: 2;
</button>
-- easy to read & style and maybe can add the original light effect (which i like) and also colored background
-- might code it, might not.
-->
            
          
!

CSS

            
              /*
  Please Do Try:
  #mouse-users: click&hold and move mouse
  #keyboard-users: press and hold "SpaceBar" while focus
*/

* {

  &,
  &::after,
  &::before {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }

}

html {

  & {
    font-size: (10/16) * 100%;
  }

}

body {

  & {
    width: 100vw;
    height: 100vh;
    background: hsl(0, 0%, 15%);
    font-family: 'Segoe UI', Tahoma, sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
  }

}

.btn {

  & {
    display: inline-block;
    position: relative;
    color: hsl(0, 0%, 94%);
    background: transparent;
    font-family: inherit;
    padding: 2rem 7rem;
    border: 0 solid transparent;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: .4rem;
    outline: .2rem solid transparent;
    outline-offset: .6rem;
    overflow: hidden;
    user-select: none;
  }

  // windows high contrast mode /start
  // =================================
  @media screen and (-ms-high-contrast: active) {

    & {
      color: buttonText;
      border: 0;
      outline-color: currentColor;
      outline-offset: .2rem;
    }

    &:hover,
    &:focus {
      background: highlight;
    }

    &::before,
    &>.span1,
    &>.span2 {
      display: none;
    }

  }

  // ===============================
  // windows high contrast mode /end

  &::before {
    content: " ";
    display: inline-block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
      linear-gradient(to right, hsla(0, 0%, 94%, .6) 0px, transparent 2px, transparent 2px),
      linear-gradient(to left, hsla(0, 0%, 94%, .6) 0px, transparent 2px, transparent 2px),
      linear-gradient(to bottom, hsla(0, 0%, 94%, .6) 0px, transparent 2px, transparent 2px),
      linear-gradient(to top, hsla(0, 0%, 94%, .6) 0px, transparent 2px, transparent 2px);
    opacity: .1;
  }

  &>* {
    display: inline-block;
    position: absolute;
    z-index: -1;
  }

  &>.span1 {
    width: 110%;
    height: 110%;
    border-radius: 100%;
    background: radial-gradient(circle at center, hsla(0, 0%, 94%, .6), transparent);
    transform: translate(-50%, -50%);
    filter: blur(4rem);
    opacity: 0;

    // windows high contrast mode /start
    // =================================
    @media screen and (-ms-high-contrast: active), (-ms-high-contrast: none) {
      display: none;
    }

    // windows high contrast mode /end
    // ===============================
  }

  &>.span2 {
    width: 0;
    height: 0;
    border-radius: 100%;
    transform: translate(-50%, -50%);
    //background: hsl(0, 0%, 94%); // uncomment this if you need background on .span2
    box-shadow: 0 0 0 0 hsl(0, 0%, 94%), inset 0 0 1rem hsl(0, 0%, 94%);
    opacity: .4;
  }

  // firefox dotted border on focus /start
  // =====================================
  &::-moz-focus-inner {
    border: 0;
    padding: 0;
  }

  // ===================================
  // firefox dotted border on focus /end

  &:active {
    transform: scale(.98); // <- this, does not work, when using keyboard in Firefox
  }

  &:focus {

    & {
      border-width: .2rem; // does not needed, but for Windows High Contrast Mode.
      outline-color: hsla(0, 0%, 94%, .2); // really bad idea to use alpha in outline-color
    }

    &>.span1 {
      top: 90% !important;
      left: 50% !important;
      opacity: 1 !important;
    }

  }

}

// Border Issue -- Outside Of The Box And Not Giving The Result I Want (Little Light Effect)
/*
.btn {

  & {
    border: .4rem solid hsla(0, 0%, 94%, .1);
  }

}
*/

// Colored Background --removes outline (z-index issue)
/*
.btn {

  &::after {
    content: " ";
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to right, hsl(220, 50%, 34%), hsl(320, 50%, 34%));
    z-index: -2;
  }

}
*/

// Original Light Effect -(hover over the button to see)
/*
.btn {

  &::after {
    content: "here";
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
  }

  &::before {
    background: hsl(0, 0%, 15%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: calc(100% - 2px);
    height: calc(100% - 2px);
    opacity: 1;
  }

}
*/

            
          
!

JS

            
              /* ?(Fluent Design)-> is by Microsoft, used in Windows 10 devices and platforms. */

// code might be messy
// ===================

var btn = document.querySelector(".btn");

function addSpans(btn) {
  var span1 = document.createElement("span");
  span1.className = "span1";

  var span2 = document.createElement("span");
  span2.className = "span2";

  btn.appendChild(span1);
  btn.appendChild(span2);
}

function mouseEnter(span) {
  span.style.opacity = "1";
}

function mouseLeave(span) {
  span.style.opacity = "0";
}

function mouseDown(span) {
  span.style.transition = "box-shadow .6s";
  span.style.boxShadow = "0 0 10rem 4rem hsl(0, 0%, 94%), inset 0 0 1rem hsl(0, 0%, 94%)";
  span.style.width = "2rem";
  span.style.height = "2rem";
}

function mouseUp(span) {
  span.style.transition = "box-shadow 0s";
  span.style.boxShadow = "0 0 0 0 hsl(0, 0%, 94%), inset 0 0 1rem hsl(0, 0%, 94%)";
  span.style.width = "0";
  span.style.height = "0";
}

function mouseMove(span, e) {
  span.style.top = e.offsetY + "px";
  span.style.left = e.offsetX + "px";
}

function keyDown(span) {
  mouseDown(span);
  span.style.top = "100%";
  span.style.left = "50%";
}

window.addEventListener("load", addSpans(btn));
var span1 = btn.querySelector(".span1");
var span2 = btn.querySelector(".span2");


// mouse events
// ============
// edge issue
// not applying filter: blur() properly
if (window.navigator.userAgent.indexOf("Edge") > -1) {
  span1.style.display = "none";
} else {
  btn.addEventListener("mouseenter", function() { mouseEnter(span1) });
  btn.addEventListener("mouseleave", function() { mouseLeave(span1) });
  btn.addEventListener("mousemove", function(e) { mouseMove(span1, e) });
}

btn.addEventListener("mouseleave", function() { mouseUp(span2)} );
btn.addEventListener("mousemove", function(e) { mouseMove(span2, e) });
btn.addEventListener("mousedown", function() { mouseDown(span2) });
btn.addEventListener("mouseup", function() { mouseUp(span2) });

// keyboard events
// ===============
btn.addEventListener("keydown", function(e) {
  if(e.key === " " && (e.code === "Space" || e.keyCode === 32) || e.key === "Spacebar" && e.keyCode === 32) {
    keyDown(span2)
  }
})
btn.addEventListener("keyup", function(e) {
  if(e.key === " " && (e.code === "Space" || e.keyCode === 32) || e.key === "Spacebar" && e.keyCode === 32) {
    mouseUp(span2)
  }
})

// touch events
// ============
btn.addEventListener("touchstart", function() { keyDown(span2) });
btn.addEventListener("touchend", function() { mouseUp(span2) });
            
          
!
999px

Console