input标签的按钮效果

https://codepen.io/anon/pen/EOPMNy

<div class="row">
<p>Click every input.</p>
</div>
<div class="row">
<span>
<input class="basic-slide" id="name" type="text" placeholder="Your best name" /><label for="name">Name</label>
</span>
<span>
<input class="basic-slide" id="email" type="text" placeholder="Your favorite email" /><label for="email">Email</label>
</span>
<span>
<input class="basic-slide" id="phone" type="text" placeholder="You can trust us" /><label for="phone">Phone</label>
</span>
</div>
<div class="row">
<span>
<input class="clean-slide" id="age" type="text" placeholder="Go for the high score!" /><label for="age">Age</label>
</span>
<span>
<input class="clean-slide" id="height" type="text" placeholder="Heels count" /><label for="height">Height</label>
</span>
<span>
<input class="clean-slide" id="weight" type="text" placeholder="Go ahead and lie" /><label for="weight">Weight</label>
</span>
</div>
<div class="row">
<span>
<input class="gate" id="class" type="text" placeholder="Wizard!" /><label for="class">Class</label>
</span>
<span>
<input class="gate" id="element" type="text" placeholder="Five to choose from" /><label for="element">Element</label>
</span>
<span>
<input class="gate" id="move" type="text" placeholder="Secret book attack!" /><label for="move">Move</label>
</span>
</div>
<div class="row">
<span>
<input class="skinny" id="english" type="text" placeholder="Do you speak it?" /><label for="english">English</label>
</span>
<span>
<input class="skinny" id="burger" type="text" placeholder="A Royale with cheese?" /><label for="burger">Burger</label>
</span>
<span>
<input class="skinny" id="wallet" type="text" placeholder="Bad Mother****er" /><label for="wallet">Wallet</label>
</span>
</div>
<div class="row">
<span>
<input class="slide-up" id="card" type="text" placeholder="Fund me!" /><label for="card">Credit Card</label>
</span>
<span>
<input class="slide-up" id="expires" type="text" placeholder="Month Day, Year" /><label for="expires">Expires</label>
</span>
<span>
<input class="slide-up" id="security" type="text" placeholder="Public" /><label for="security">Security Code</label>
</span>
</div>
<div class="row">
<span>
<input class="card-slide" id="knock" type="text" placeholder="Who's there?" /><label for="knock">Knock knock</label>
</span>
<span>
<input class="card-slide" id="max" type="text" placeholder="Max who?" /><label for="max">Max</label>
</span>
<span>
<input class="card-slide" id="out" type="text" placeholder="Sunuva..." /><label for="out">Maxed out card ;)</label>
</span>
</div>
<div class="row">
<span>
<input class="swing" id="artist" type="text" placeholder="BO$$" /><label for="artist">Artist</label>
</span>
<span>
<input class="swing" id="song" type="text" placeholder="I don't give a ****" /><label for="song">Song</label>
</span>
<span>
<input class="swing" id="eyes" type="text" placeholder="Crazy" /><label for="eyes">Eyes</label>
</span>
</div>
<div class="row">
<span>
<input class="balloon" id="state" type="text" placeholder="Liquid, solid, gaseous..." /><label for="state">State</label>
</span>
<span>
<input class="balloon" id="planet" type="text" placeholder="Probably Earth" /><label for="planet">Planet</label>
</span>
<span>
<input class="balloon" id="galaxy" type="text" placeholder="Milky Way?" /><label for="galaxy">Galaxy</label>
</span>
</div>

@import "compass/css3";

@import url(https://fonts.googleapis.com/css?family=Open+Sans:400,700,600,300,800);

* {
box-sizing: border-box;
}
html,
body {
overflow-x: hidden;
font-family: "Open Sans", sans-serif;
font-weight: 300;
color: #fff;
background: #efefef;
}
@mixin epic-sides() { // https://codepen.io/MichaelArestad/pen/qltuk
position: relative;
z-index: 1;

&:before {
position: absolute;
content: "";
display: block;
top: 0;
left: -5000px;
height: 100%;
width: 15000px;
z-index: -1;
@content;
}
}
.row {
max-width: 800px;
margin: 0 auto;
padding: 60px 30px;
background: #032429;
@include epic-sides() {background: inherit;}
text-align: center;

&:first-child {
padding: 40px 30px;
}
&:nth-child(2),
&:nth-child(8),
&:nth-child(10){
background: #134A46;
}
&:nth-child(3),
&:nth-child(7) {
background: #377D6A;
}
&:nth-child(4),
&:nth-child(6) {
background: #7AB893;
}
&:nth-child(5) {
background: #B2E3AF;
}

span {
position: relative;
display: inline-block;
margin: 30px 10px;
}
}
.basic-slide {
display: inline-block;
width: 215px;
padding: 10px 0 10px 15px;
font-family: "Open Sans", sans;
font-weight: 400;
color: #377D6A;
background: #efefef;
border: 0;
border-radius: 3px;
outline: 0;
text-indent: 70px; // Arbitrary.
transition: all .3s ease-in-out;

&::-webkit-input-placeholder {
color: #efefef;
text-indent: 0;
font-weight: 300;
}

+ label {
display: inline-block;
position: absolute;
top: 0;
left: 0;
padding: 10px 15px;
text-shadow: 0 1px 0 rgba(19,74,70,.4);
background: #7AB893;
transition: all .3s ease-in-out;
border-top-left-radius: 3px;
border-bottom-left-radius: 3px;
}
}
.basic-slide:focus,
.basic-slide:active {
color: #377D6A;
text-indent: 0;
background: #fff;
border-top-left-radius: 0;
border-bottom-left-radius: 0;

&::-webkit-input-placeholder {
color: #aaa;
}
+ label {
transform: translateX(-100%);
}
}
.clean-slide {
position: relative;
display: inline-block;
width: 215px;
padding: 10px 0 10px 15px;
font-family: "Open Sans", sans;
font-weight: 400;
color: #377D6A;
background: #efefef;
border: 0;
border-radius: 3px;
outline: 0;
text-indent: 60px; // Arbitrary.
transition: all .3s ease-in-out;

&::-webkit-input-placeholder {
color: #efefef;
text-indent: 0;
font-weight: 300;
}

+ label {
display: inline-block;
position: absolute;
transform: translateX(0);
top: 0;
left: 0;
bottom: 0;
padding: 13px 15px;
font-size: 11px;
font-weight: 700;
text-transform: uppercase;
color: #032429;
text-align: left;
text-shadow: 0 1px 0 rgba(255,255,255,.4);
transition: all .3s ease-in-out, color .3s ease-out;
border-top-left-radius: 3px;
border-bottom-left-radius: 3px;
overflow: hidden;

&:after {
content: "";
position: absolute;
top: 0;
right: 100%;
bottom: 0;
width: 100%;
background: #7AB893;
z-index: -1;
transform: translate(0);
transition: all .3s ease-in-out;
border-top-left-radius: 3px;
border-bottom-left-radius: 3px;
}
}
}
.clean-slide:focus,
.clean-slide:active {
color: #377D6A;
text-indent: 0;
background: #fff;
border-top-left-radius: 0;
border-bottom-left-radius: 0;

&::-webkit-input-placeholder {
color: #aaa;
}
+ label {
color: #fff;
text-shadow: 0 1px 0 rgba(19,74,70,.4);
transform: translateX(-100%);

&:after {
transform: translate(100%);
}
}
}
.gate {
display: inline-block;
width: 215px;
padding: 10px 0 10px 15px;
font-family: "Open Sans", sans;
font-weight: 400;
color: #377D6A;
background: #efefef;
border: 0;
border-radius: 3px;
outline: 0;
text-indent: 65px; // Arbitrary.
transition: all .3s ease-in-out;

&::-webkit-input-placeholder {
color: #efefef;
text-indent: 0;
font-weight: 300;
}

+ label {
display: inline-block;
position: absolute;
top: 0;
left: 0;
padding: 10px 15px;
text-shadow: 0 1px 0 rgba(19,74,70,.4);
background: #7AB893;
transition: all .4s ease-in-out;
border-top-left-radius: 3px;
border-bottom-left-radius: 3px;
transform-origin: left bottom;
z-index: 99;

&:before,
&:after {
content: "";
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
border-radius: 3px;
background: #377D6A;
transform-origin: left bottom;
transition: all .4s ease-in-out;
pointer-events: none;
z-index: -1;
}
&:before {
background: rgba(3,36,41,.2);
z-index: -2;
right: 20%;
}
}
}
span:nth-child(2) .gate {
text-indent: 85px;
}
span:nth-child(2) .gate:focus,
span:nth-child(2) .gate:active{
text-indent: 0;
}
.gate:focus,
.gate:active {
color: #377D6A;
text-indent: 0;
background: #fff;
border-top-right-radius: 3px;
border-bottom-right-radius: 3px;

&::-webkit-input-placeholder {
color: #aaa;
}
+ label {
transform: rotate(-66deg);
border-radius: 3px;

&:before {
transform: rotate(10deg);
}
}
}
.skinny {
display: inline-block;
width: 215px;
padding: 10px 0 10px 15px;
font-family: "Open Sans", sans;
font-weight: 400;
color: #377D6A;
background: #efefef;
border: 0;
border-radius: 3px;
outline: 0;
text-indent: 75px; // Arbitrary.
transition: all .3s ease-in-out;

&::-webkit-input-placeholder {
color: #efefef;
text-indent: 0;
font-weight: 300;
}

+ label {
display: inline-block;
position: absolute;
transform: translateX(0);
top: 0;
left: 0;
padding: 10px 15px;
text-shadow: 0 1px 0 rgba(19,74,70,.4);
transition: all .3s ease-in-out;
border-top-left-radius: 3px;
border-bottom-left-radius: 3px;
overflow: hidden;

&:before,
&:after {
content: "";
position: absolute;
right: 0;
left: 0;
z-index: -1;
transition: all .3s ease-in-out;
}
&:before {
// Skinny bit here
top: 5px;
bottom: 5px;
background: #377D6A; // change this to #134A46
border-top-left-radius: 3px;
border-bottom-left-radius: 3px;
}
&:after {
top: 0;
bottom: 0;
background: #377D6A;
}
}
}
.skinny:focus,
.skinny:active {
color: #377D6A;
text-indent: 0;
background: #fff;

&::-webkit-input-placeholder {
color: #aaa;
}
+ label {
transform: translateX(-100%);

&:after {
transform: translateX(100%);
}
}
}
.slide-up {
display: inline-block;
width: 215px;
padding: 10px 0 10px 15px;
font-family: "Open Sans", sans;
font-weight: 400;
color: #377D6A;
background: #efefef;
border: 0;
border-radius: 3px;
outline: 0;
text-indent: 80px; // Arbitrary.
transition: all .3s ease-in-out;

&::-webkit-input-placeholder {
color: #efefef;
text-indent: 0;
font-weight: 300;
}

+ label {
display: inline-block;
position: absolute;
transform: translateX(0);
top: 0;
left: 0;
padding: 10px 15px;
text-shadow: 0 1px 0 rgba(19,74,70,.4);
transition: all .3s ease-in-out;
border-top-left-radius: 3px;
border-bottom-left-radius: 3px;
overflow: hidden;

&:before,
&:after {
content: "";
position: absolute;
right: 0;
left: 0;
z-index: -1;
transition: all .3s ease-in-out;
}
&:before {
// Skinny bit here
top: 6px;
left: 5px;
right: 5px;
bottom: 6px;
background: #377D6A; // change this to #134A46
}
&:after {
top: 0;
bottom: 0;
background: #377D6A;
}
}
}
span:nth-child(1) .slide-up {
text-indent: 105px;
}
span:nth-child(3) .slide-up {
text-indent: 125px;
}
span:nth-child(1) .slide-up:focus,
span:nth-child(1) .slide-up:active,
span:nth-child(3) .slide-up:focus,
span:nth-child(3) .slide-up:active {
text-indent: 0;
}
.slide-up:focus,
.slide-up:active {
color: #377D6A;
text-indent: 0;
background: #fff;

&::-webkit-input-placeholder {
color: #aaa;
}
+ label {
transform: translateY(-100%);

&:before {
border-radius: 5px;
}
&:after {
transform: translateY(100%);
}
}
}
.card-slide {
display: inline-block;
width: 215px;
padding: 10px 0 10px 15px;
font-family: "Open Sans", sans;
font-weight: 400;
color: #377D6A;
background: #efefef;
border: 0;
border-radius: 3px;
outline: 0;
text-indent: 115px; // Arbitrary.
transition: all .3s ease-in-out;

&::-webkit-input-placeholder {
color: #efefef;
text-indent: 0;
font-weight: 300;
}

+ label {
display: block;
position: absolute;
top: 0;
left: 0;
padding: 10px 15px;
text-shadow: 0 1px 0 rgba(19,74,70,.4);
background: #7AB893;
transition: all .3s ease-in-out;
border-top-left-radius: 3px;
border-bottom-left-radius: 3px;
transform-origin: right center;
transform: perspective(300px) scaleX(1) rotateY(0deg);
}
}
span:nth-child(2) .card-slide {
text-indent: 55px;
}
span:nth-child(3) .card-slide {
text-indent: 150px;
}
span:nth-child(2) .card-slide:focus,
span:nth-child(2) .card-slide:active,
span:nth-child(3) .card-slide:focus,
span:nth-child(3) .card-slide:active {
text-indent: 0;
}
.card-slide:focus,
.card-slide:active {
color: #377D6A;
text-indent: 0;
background: #fff;
border-top-left-radius: 0;
border-bottom-left-radius: 0;

&::-webkit-input-placeholder {
color: #aaa;
}
+ label {
transform: perspective(600px) translateX(-100%) rotateY(80deg);
}
}
.swing {
display: inline-block;
width: 215px;
padding: 10px 0 10px 15px;
font-family: "Open Sans", sans;
font-weight: 400;
color: #377D6A;
background: #efefef;
border: 0;
border-radius: 3px;
outline: 0;
text-indent: 60px; // Arbitrary.
transition: all .3s ease-in-out;

&::-webkit-input-placeholder {
color: #efefef;
text-indent: 0;
font-weight: 300;
}

+ label {
display: inline-block;
position: absolute;
top: 0;
left: 0;
padding: 10px 15px;
text-shadow: 0 1px 0 rgba(19,74,70,.4);
background: #7AB893;
border-top-left-radius: 3px;
border-bottom-left-radius: 3px;
transform-origin: 2px 2px;
transform: rotate(0);
// There should be a better way
animation: swing-back .4s 1 ease-in-out;
}
}
@keyframes swing {
0% {
transform: rotate(0);
}
20% {
transform: rotate(116deg);
}
40% {
transform: rotate(60deg);
}
60% {
transform: rotate(98deg);
}
80% {
transform: rotate(76deg);
}
100% {
transform: rotate(82deg);
}
}
@keyframes swing-back {
0% {
transform: rotate(82deg);
}
100% {
transform: rotate(0);
}
}
.swing:focus,
.swing:active {
color: #377D6A;
text-indent: 0;
background: #fff;
border-top-left-radius: 0;
border-bottom-left-radius: 0;

&::-webkit-input-placeholder {
color: #aaa;
}
+ label {
animation: swing 1.4s 1 ease-in-out;
transform: rotate(82deg);
}
}
.balloon {
// As suggested by https://twitter.com/dbox/status/365888496486985728
display: inline-block;
width: 215px;
padding: 10px 0 10px 15px;
font-family: "Open Sans", sans;
font-weight: 400;
color: #377D6A;
background: #efefef;
border: 0;
border-radius: 3px;
outline: 0;
text-indent: 60px; // Arbitrary.
transition: all .3s ease-in-out;

&::-webkit-input-placeholder {
color: #efefef;
text-indent: 0;
font-weight: 300;
}

+ label {
display: inline-block;
position: absolute;
top: 8px;
left: 0;
bottom: 8px;
padding: 5px 15px;
color: #032429;
font-size: 11px;
font-weight: 700;
text-transform: uppercase;
text-shadow: 0 1px 0 rgba(19,74,70,0);
transition: all .3s ease-in-out;
border-radius: 3px;
background: rgba(122,184,147,0);

&:after {
position: absolute;
content: "";
width: 0;
height: 0;
top: 100%;
left: 50%;
margin-left: -3px;
border-left: 3px solid transparent;
border-right: 3px solid transparent;
border-top: 3px solid rgba(122,184,147,0);
transition: all .3s ease-in-out;
}
}
}
.balloon:focus,
.balloon:active {
color: #377D6A;
text-indent: 0;
background: #fff;

&::-webkit-input-placeholder {
color: #aaa;
}
+ label {
color: #fff;
text-shadow: 0 1px 0 rgba(19,74,70,.4);
background: rgba(122,184,147,1);
transform: translateY(-40px);

&:after {
border-top: 4px solid rgba(122,184,147,1);
}
}
}