纯CSS3实现漂亮的input输入框动画样式库(Text input love)

.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 {