---
description: https://codepen.io/Ruddy/pen/09052b957d82a17bd6ca70ac6663dd6a
---

# Click Button background-hover white (ok)

```
<div>Button</div>
```

```
div {
  width: 220px;
  height: 120px;
  background: #222;
  color: #fff;
  text-align: center;
  line-height: 120px;
  font-size: 40px;
}

/*  Ripple */

.ripple {
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  transform: scale(0);
  position: absolute;
  opacity: 1;
}
.rippleEffect {
    animation: rippleDrop .6s linear;
}

@keyframes rippleDrop {
  100% {
    transform: scale(2);
    opacity: 0;
  }
}
```

```
$("div").click(function (e) {
  
  // Remove any old one
  $(".ripple").remove();

  // Setup
  var posX = $(this).offset().left,
      posY = $(this).offset().top,
      buttonWidth = $(this).width(),
      buttonHeight =  $(this).height();
  
  // Add the element
  $(this).prepend("<span class='ripple'></span>");

  
 // Make it round!
  if(buttonWidth >= buttonHeight) {
    buttonHeight = buttonWidth;
  } else {
    buttonWidth = buttonHeight; 
  }
  // Get the center of the element
  var x = e.pageX - posX - buttonWidth / 2;
  var y = e.pageY - posY - buttonHeight / 2;
  // Add the ripples CSS and start the animation
  $(".ripple").css({
    width: buttonWidth,
    height: buttonHeight,
    top: y + 'px',
    left: x + 'px'
  }).addClass("rippleEffect");
});
```

Ví dụ mẫu:

```
<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
  <meta http-equiv="x-ua-compatible" content="ie=edge">
  <title>Material Design Bootstrap</title>
  <style type="text/css" media="screen">
  .buttonwhite {
    width: 220px;
    height: 120px;
    background: #222;
    color: #fff;
    text-align: center;
    line-height: 120px;
    font-size: 40px;
  }
  .ripple {
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.4);
    transform: scale(0);
    position: absolute;
    opacity: 1;
  }
  .rippleEffect {
    animation: rippleDrop .6s linear;
  }
  @keyframes rippleDrop {
    100% {
      transform: scale(2);
      opacity: 0;
    }
  }
  </style>
</head>

<body>
  <div class="buttonwhite">Button</div>
  <script type="text/javascript" src="https://code.jquery.com/jquery-3.4.1.min.js"></script>
  <script>
  $("div").click(function(e) {
    $(".ripple").remove();
    var posX = $(this).offset().left,
      posY = $(this).offset().top,
      buttonWidth = $(this).width(),
      buttonHeight = $(this).height();
    $(this).prepend("<span class='ripple'></span>");
    if(buttonWidth >= buttonHeight) {
      buttonHeight = buttonWidth;
    } else {
      buttonWidth = buttonHeight;
    }
    var x = e.pageX - posX - buttonWidth / 2;
    var y = e.pageY - posY - buttonHeight / 2;
    $(".ripple").css({
      width: buttonWidth,
      height: buttonHeight,
      top: y + 'px',
      left: x + 'px'
    }).addClass("rippleEffect");
  });
  </script>
</body>

</html>
```

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