css过渡与线性渐变

Question

我正在尝试添加一个按钮,我有一个按钮,它的背景是用css线性渐变制作的,但它不起作用.

这是我的按钮的CSS.

a.button
{
background: -webkit-gradient(linear, left top, left bottom, color-stop(0%,@green), color-stop(100%,#a5c956));
-webkit-transition: background 5s linear;
}

a.button:hover
{
-webkit-gradient(linear, left top, left bottom, color-stop(0%,@greenhover), color-stop(100%,#89af37))
}

如果你想知道@green和@greenhover,我正在使用.less来制作我的CSS.

这有什么不对吗？有任何想法吗？

Answer 1

可悲的是,你现在真的无法过渡渐变.

因此,唯一可行的解​​决方法是使用具有所需渐变的额外元素并转换它的不透明度:

a.button {
  position: relative;
  z-index: 9;
  display: inline-block;
  padding: 0 10px;
  background: -webkit-gradient(linear, 0 0, 0 100%, from(green), to(#a5c956));
  background: -webkit-linear-gradient(top, green, #a5c956);
  background: -moz-linear-gradient(top, green, #a5c956);
  background: -o-linear-gradient(top, green, #a5c956);
  background: linear-gradient(top, green, #a5c956);
}

.button-helper {
  position: absolute;
  z-index: -1;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  background: -webkit-gradient(linear, 0 0, 0 100%, from(lime), to(#89af37));
  background: -webkit-linear-gradient(top, lime, #89af37);
  background: -moz-linear-gradient(top, lime, #89af37);
  background: -o-linear-gradient(top, lime, #89af37);
  background: linear-gradient(top, lime, #89af37);
  -webkit-transition: opacity 1s linear;
  -moz-transition: opacity 1s linear;
  -o-transition: opacity 1s linear;
  transition: opacity 1s linear;
}

a.button:hover .button-helper {
  opacity: 1;
}

<a href="#" class="button"><span class="button-helper"></span>button</a>

Answer 2

这很棘手..而且当然很棘手很酷;)

好的..我有一个解决方案.它基本上是通过惊人的:before选择器完成的

#cool-hover{
	width: 120px;
	height: 120px;
	display: block;
	cursor: pointer;
	border-radius: 10px;
	box-shadow: 0 0 15px rgba(0,0,0,0.3);
	margin: 0px auto 24px auto;
	transition: all 0.5s;
	position: relative;
	overflow: hidden;
}
#cool-hover:before{
	border-radius: inherit;
	display: block;
	width: 200%;
	height: 200%;
	content: '';
        position: absolute;
        top: 0; 
        left: 0;
	background: linear-gradient(135deg, #21d4fd 25%, #b721ff 75%);	
	transition: all 0.5s;
	transform: translate(-25%, -25%);
	z-index: 0;
}
#cool-hover:after{
	border-radius: 9px;
	display: block;
	width: 108px;
	height: 108px;
	margin: 6px;
	background: url('https://i.imgur.com/w0BjFgr.png');
	background-size: cover;
	content: '';
	position: absolute;
	top: 0; left: 0;
	z-index: 1;
}
#cool-hover:hover:before{
	transform: translate(-25%, -25%) rotate(-180deg);
}
#cool-hover:hover{
	box-shadow: 0 0 35px rgba(0,0,0,0.3);
}

<div id="cool-hover"></div>

注意:我刚刚:after为顶级图像占位符目的添加了sudo类.

有一个很棒的造型;)

Answer 3

我知道这很老了，但我还找不到任何好的解决方案。所以这是我的解决方案

首先在 ":before 上制作渐变并使用不透明度隐藏它，然后在悬停时过渡不透明度 1。

https://jsfiddle.net/sumon380/osqLpboc/3/

.button {
    text-decoration: none;
    padding: 10px 25px;
    font-size: 20px;
    color: #333;
    display: inline-block;
    background: #d6e9eb;
    position: relative;
    z-index: 1;
    transition: color 0.3s ease-out;

}
.button:before {
    background: #91a5f4;
    background: linear-gradient(135deg, #91a5f4 0%, #b08cf9 86%);
    content: "";
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    position: absolute;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease-out;
}
.button:hover:before {
    opacity: 1;
}
.button:hover {
    color: #fff;
}

<a class="button" href="#">Button</a>

Answer 4

您可以使用阴影伪造渐变过渡！例如，从我的页面之一：

c { 
color: #FFF;
background: #000;
border-style:solid;
border-color:#CCC;
border-width: 0 0 0 1px;
box-shadow: 2px 2px 2px #555, inset 0 25px 20px -10px rgba(255, 255, 255, 0.3),
    inset 0 -15px 20px -10px rgba(0, 0, 0, 0.15);
-moz-box-shadow: 2px 2px 2px #555, inset 0 25px 20px -10px rgba(255, 255, 255, 0.3),
    inset 0 -15px 20px -10px rgba(0, 0, 0, 0.15);
-o-box-shadow: 2px 2px 2px #555, inset 0 25px 20px -10px rgba(255, 255, 255, 0.3),
    inset 0 -15px 20px -10px rgba(0, 0, 0, 0.15);
-webkit-box-shadow: 2px 2px 2px #555,
    inset 0 25px 20px -10px rgba(255, 255, 255, 0.3),
    inset 0 -15px 20px -10px rgba(0, 0, 0, 0.15);
-moz-transition: background-color .5s ease; 
-o-transition: background-color .5s ease; 
-webkit-transition: background-color .5s ease-in-out; 
transition: background-color .5s ease;
}

其次是：

c:hover {
color:#FFF;
background: #505;
position:relative;
top:1px;
box-shadow: -1px -1px -1px #555,inset 0 20px 20px -10px rgba(0, 0, 0, 0.15), 
        inset 0 -15px 20px -10px rgba(255, 255, 255, 0.3);
-moz-box-shadow: -1px -1px -1px #555,inset 0 20px 20px -10px rgba(0, 0, 0, 0.15),
    inset 0 -15px 20px -10px rgba(255, 255, 255, 0.3);
-o-box-shadow: -1px -1px -1px #555, inset 0 20px 20px -10px rgba(0, 0, 0, 0.15), 
        inset 0 -15px 20px -10px rgba(255, 255, 255, 0.3);
-webkit-box-shadow: 1px -1px -1px #555, inset 0 20px 20px -10px rgba(0, 0, 0, 0.15), 
    inset 0 -15px 20px -10px rgba(255, 255, 255, 0.3);
}

在这里，您实际上是在使用嵌入式阴影作为类似Photoshop的蒙版，从而对基础元素造成渐变效果。悬停时，反转效果。