CSS 按钮将线性渐变背景转换为透明背景

CSS button transition linear-gradient background into transparent background

我有一个带有线性渐变背景、橙色边框和一些文本的按钮。当我将鼠标悬停在按钮上时,我希望背景变为透明而不更改按钮的其他属性。

我尝试将不透明度转换为 0,但显然,这会隐藏边框和文本。我也尝试过转换背景,但它不起作用,因为我没有要转换到的端点,因为它需要透明。

body {
    background-color: darkblue;
}

.button {
    background-image: linear-gradient(red,yellow);
    border: solid orange 2px;
    border-radius: 10px;
    color: white;
    padding: 15px 25px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 24px;
}
<button class="button">Submit</button>

这可能有帮助:

body {
    background-color: darkblue;
}

.button {
    background-image: linear-gradient(red,yellow);
    border: solid orange 2px;
    border-radius: 10px;
    color: white;
    padding: 15px 25px;
    text-align: center;
    text-decoration: none;
    display: inline-block;
    font-size: 24px;
    transition: 2s;
    z-index: 1000;
    
}
button:hover{
background:linear-gradient(transparent, transparent);
}
<button class="button">Submit</button>
所以,我只是将悬停设置为透明的线性渐变,因为你没有固定的颜色。

现在我们可以使用新的 @property. See the support table.

@property --alpha {
  syntax: '<number>';
  inherits: false;
  initial-value: 1;
}

body {
  background-color: darkblue;
}

.button {
  background-image: linear-gradient(rgba(255, 0, 0, var(--alpha)), rgba(255, 255, 0, var(--alpha)));
  transition: --alpha 1s;
  background-color: transparent;
  border: solid orange 2px;
  border-radius: 10px;
  color: white;
  padding: 15px 25px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 24px;
}

.button:hover {
  --alpha: 0;
}
<button class="button">Submit</button>

为背景使用一个伪元素,你可以很容易地做到这一点:

body {
  background-color: darkblue;
}

.button {
  border: solid orange 2px;
  border-radius: 10px;
  color: white;
  padding: 15px 25px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 24px;
  position: relative;
  overflow: hidden;
  z-index:0;
  background:transparent;
}

.button::before {
  content: "";
  position: absolute;
  z-index:-1;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: linear-gradient(red, yellow);
  transition:1s;
}
.button:hover::before {
  opacity:0;
}
<button class="button">Submit</button>

这是另一个不使用伪元素的想法,您可以依靠更改 background-colorbackground-size。诀窍是保持其中一种渐变颜色透明,以便我们可以看到 background-color(您可以将此渐变颜色过渡为透明)。然后你增加background-size来隐藏底部的颜色,我们只看到透明的。

body {
  background-color: darkblue;
}

.button {
  border: solid orange 2px;
  background-image: linear-gradient(transparent, yellow);
  background-size:100% 100%;
  background-color:red;
  border-radius: 10px;
  color: white;
  padding: 15px 25px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 24px;
  transition:1s;
}

.button:hover {
  background-color:transparent;
  background-size:100% 500%;
}
<button class="button">Submit</button>


或考虑调整background-size以进行另一种过渡:

body {
  background-color: darkblue;
}

.button {
  border: solid orange 2px;
  background: 
    linear-gradient(red, yellow),
    transparent;
  background-size:100% 100%;
  background-position:left; /*change this to change the way the transtion happen*/
  background-repeat:no-repeat;
  border-radius: 10px;
  color: white;
  padding: 15px 25px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 24px;
  transition:1s;
}

.button:hover {
  background-size:0% 100%;
}
<button class="button">Submit</button>

在 Chrome 中启用实验性 Web 平台功能 (see) 我们可以使用:

CSS.registerProperty({
  name: '--alpha', 
  syntax: '<number>', 
  initialValue: 1, 
  inherits: true,
})
body {
  background-color: darkblue;
}

.button {
  --alpha: 1;
  background: linear-gradient(rgba(255,0,0,var(--alpha)), rgba(255,255,0,var(--alpha))) transparent;
  border: solid orange 2px;
  border-radius: 10px;
  color: white;
  padding: 15px 25px;
  text-align: center;
  text-decoration: none;
  display: inline-block;
  font-size: 24px;
  transition: --alpha 1s linear;
}

.button:hover {
  --alpha: 0;
}
<button class="button">Submit</button>