八种让人眼前一亮的CSS HOVER效果~

<div id="send-btn">
<button>
    // 这里是一个svg的占位
    Send
</button>
</div>

#send-btn{
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
}
button {
background: #5f55af;
border: 0;
border-radius: 5px;
padding: 10px 30px 10px 20px;
color: white;
text-transform: uppercase;
font-weight: bold;
}
button svg {
display: inline-block;
vertical-align: middle;
padding-right: 5px;
}
button:hover svg {
animation: fly 2s ease 1;
}
@keyframes fly {
  0% {
transform: translateX(0%);
  }
  50% {
transform: translateX(300%);
  }
  100% {
transform: translateX(0);
  }
}

<div id="neon-btn">
<button class="btn one">Hover me</button>
<button  class="btn two">Hover me</button>
<button  class="btn three">Hover me</button>
</div>

#neon-btn {
display: flex;
align-items: center;
justify-content: space-around;
height: 100vh;
background: #031628; 
}
.btn {
border: 1px solid;
background-color: transparent;
text-transform: uppercase;
font-size: 14px;
padding: 10px 20px;
font-weight: 300;
}
.one {
color: #4cc9f0;
}
.two {
color: #f038ff; 
}
.three {
color: #b9e769;
}
.btn:hover {
color: white;
border: 0;
}
.one:hover {
background-color: #4cc9f0;
-webkit-box-shadow: 10px 10px 99px 6px rgba(76,201,240,1);
-moz-box-shadow: 10px 10px 99px 6px rgba(76,201,240,1);
box-shadow: 10px 10px 99px 6px rgba(76,201,240,1);
}
.two:hover {
background-color: #f038ff;
-webkit-box-shadow: 10px 10px 99px 6px rgba(240, 56, 255, 1);
-moz-box-shadow: 10px 10px 99px 6px rgba(240, 56, 255, 1);
box-shadow: 10px 10px 99px 6px rgba(240, 56, 255, 1);
}
.three:hover {
background-color: #b9e769;
-webkit-box-shadow: 10px 10px 99px 6px rgba(185, 231, 105, 1);
-moz-box-shadow: 10px 10px 99px 6px rgba(185, 231, 105, 1);
box-shadow: 10px 10px 99px 6px rgba(185, 231, 105, 1);
}

<div id="draw-border">
<button>Hover me</button>
</div>

#draw-border {
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
}
button {
border: 0;
background: none;
text-transform: uppercase;
color: #4361ee;
font-weight: bold;
position: relative;
outline: none;
padding: 10px 20px;
box-sizing: border-box;
}
button::before, button::after {
box-sizing: inherit;
position: absolute;
content: '';
border: 2px solid transparent;
width: 0;
height: 0;
}
button::after {
bottom: 0;
right: 0;
}
button::before {
top: 0;
left: 0;
}
button:hover::before, button:hover::after {
width: 100%;
height: 100%;
}
button:hover::before {
border-top-color: #4361ee;
border-right-color: #4361ee;
transition: width 0.3s ease-out, height 0.3s ease-out 0.3s;
}
button:hover::after {
border-bottom-color: #4361ee;
border-left-color: #4361ee;
transition: border-color 0s ease-out 0.6s, width 0.3s ease-out 0.6s, height 0.3s ease-out 1s;
}

<div id="circle-btn">
<div class="btn-container">
    // 这里有一个svg元素
<button>Hover me</button>
</div>
</div>

#circle-btn { 
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
}
.btn-container {
position: relative;  
}
button {
border: 0;
border-radius: 50px;
color: white;
background: #5f55af;
padding: 15px 20px 16px 60px;
text-transform: uppercase;
background: linear-gradient(to right, #f72585 50%, #5f55af 50%);
background-size: 200% 100%;
background-position: right bottom;
transition:all 2s ease;
}
svg {
background: #f72585;
padding: 8px;
border-radius: 50%;
position: absolute;
left: 0;
top: 0%;
}
button:hover {
background-position: left bottom;
}

<div id="border-btn">
<button>Hover me</button>
</div>

#border-btn { 
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
}
button {
border: 0;
border-radius: 10px;
background: #2ec4b6;
text-transform: uppercase;
color: white;
font-size: 16px;
font-weight: bold;
padding: 15px 30px;
outline: none;
position: relative;
transition: border-radius 3s;
-webkit-transition: border-radius 3s;
}
button:hover {
border-bottom-right-radius: 50px;
border-top-left-radius: 50px;
border-bottom-left-radius: 10px;
border-top-right-radius: 10px;
}

<div id="frozen-btn">
<button class="green">Hover me</button>
<button class="purple">Hover me</button>
</div>

#frozen-btn {
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
}
button {
border: 0;
margin: 20px;
text-transform: uppercase;
font-size: 20px;
font-weight: bold;
padding: 15px 50px;
border-radius: 50px;
color: white;
outline: none;
position: relative;
}
button:before{
content: '';
display: block;
background: linear-gradient(to left, rgba(255, 255, 255, 0) 50%, rgba(255, 255, 255, 0.4) 50%);
background-size: 210% 100%;
background-position: right bottom;
height: 100%;
width: 100%;
position: absolute;
top: 0;
bottom:0;
right:0;
left: 0;
border-radius: 50px;
transition: all 1s;
-webkit-transition: all 1s;
}
.green {
background-image: linear-gradient(to right, #25aae1, #40e495);
box-shadow: 0 4px 15px 0 rgba(49, 196, 190, 0.75);
}
.purple {
background-image: linear-gradient(to right, #6253e1, #852D91);
box-shadow: 0 4px 15px 0 rgba(236, 116, 149, 0.75);
}
.purple:hover:before {
background-position: left bottom;
}
.green:hover:before {
background-position: left bottom;
}

<div id="shiny-shadow">
<button><span>Hover me</span></button>
</div>

#shiny-shadow {
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
background: #1c2541;
}
button {
border: 2px solid white;
background: transparent;
text-transform: uppercase;
color: white;
padding: 15px 50px;
outline: none;
overflow: hidden;
position: relative;
}
span {
z-index: 20;  
}
button:after {
content: '';
display: block;
position: absolute;
top: -36px;
left: -100px;
background: white;
width: 50px;
height: 125px;
opacity: 20%;
transform: rotate(-45deg);
}
button:hover:after {
left: 120%;
transition: all 600ms cubic-bezier(0.3, 1, 0.2, 1);
-webkit-transition: all 600ms cubic-bezier(0.3, 1, 0.2, 1);
}

<div id="loading-btn">
<button><span>Hover me</span></button>
</div>

#loading-btn {
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
}
button {
background: transparent;
border: 0;
border-radius: 0;
text-transform: uppercase;
font-weight: bold;
font-size: 20px;
padding: 15px 50px;
position: relative;
}
button:before {
transition: all 0.8s cubic-bezier(0.7, -0.5, 0.2, 2);
content: '';
width: 1%;
height: 100%;
background: #ff5964;
position: absolute;
top: 0;
left: 0;
}
button span {
mix-blend-mode: darken;
}
button:hover:before {
background: #ff5964;
width: 100%;
}