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# Click Button background-hover white (ok)
```
Button
```
```
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("");
// 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:
```
Material Design Bootstrap
Button
```
{% file src="/files/-LvPqa-p7DS-s1mmrjG7" %}
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