使用CSS3 box-shadow实现的7个按钮悬停动画特效

<template>
   <div  class="example-boxshadowbtn">
        <div class="buttons">
            <h1>按钮hover效果<code>box-shadow</code></h1>
            <button class="fill">Fill In</button>
            <button class="pulse">Pulse</button>
            <button class="close">Close</button>
            <button class="raise">Raise</button>
            <button class="up">Fill Up</button>
            <button class="slide">Slide</button>
            <button class="offset">Offset</button>
        </div>
   </div>
</template>
<style>
.fill:hover,
.fill:focus {
    box-shadow: inset 0 0 0 2em var(--hover);
}
.pulse:hover,
.pulse:focus {
    -webkit-animation: pulse 1s;
    animation: pulse 1s;
    box-shadow: 0 0 0 2em rgba(255, 255, 255, 0);
}
@-webkit-keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 var(--hover);
    }
}
@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 var(--hover);
    }
}
.close:hover,
.close:focus {
    box-shadow: inset -3.5em 0 0 0 var(--hover), inset 3.5em 0 0 0 var(--hover);
}
.raise:hover,
.raise:focus {
    box-shadow: 0 0.5em 0.5em -0.4em var(--hover);
    -webkit-transform: translateY(-0.25em);
    transform: translateY(-0.25em);
}
.up:hover,
.up:focus {
    box-shadow: inset 0 -3.25em 0 0 var(--hover);
}
.slide:hover,
.slide:focus {
    box-shadow: inset 6.5em 0 0 0 var(--hover);
}
.offset {
    box-shadow: 0.3em 0.3em 0 0 var(--color), inset 0.3em 0.3em 0 0 var(--color);
}
.offset:hover,
.offset:focus {
    box-shadow: 0 0 0 0 var(--hover), inset 6em 3.5em 0 0 var(--hover);
}
.fill {
    --color: #a972cb;
    --hover: #cb72aa;
}
.pulse {
    --color: #ef6eae;
    --hover: #ef8f6e;
}
.close {
    --color: #ff7f82;
    --hover: #ffdc7f;
}
.raise {
    --color: #ffa260;
    --hover: #e5ff60;
}
.up {
    --color: #e4cb58;
    --hover: #94e458;
}
.slide {
    --color: #8fc866;
    --hover: #66c887;
}
.offset {
    --color: #19bc8b;
    --hover: #1973bc;
}
button {
    color: var(--color);
    -webkit-transition: 0.25s;
    transition: 0.25s;
}
button:hover,
button:focus {
    border-color: var(--hover);
    color: #fff;
}
.example-boxshadowbtn {
    color: #fff;
    background: #17181c;
    font: 300 1em 'Fira Sans', sans-serif;
    -webkit-box-pack: center;
    -ms-flex-pack: center;
    justify-content: center;
    -ms-flex-line-pack: center;
    align-content: center;
    -webkit-box-align: center;
    -ms-flex-align: center;
    align-items: center;
    text-align: center;
    min-height: 60vh;
    display: -webkit-box;
    display: -ms-flexbox;
    display: flex;
}
button {
    background: none;
    border: 2px solid;
    font: inherit;
    line-height: 1;
    margin: 0.5em;
    padding: 1em 2em;
    cursor:pointer;
}
</style>