Botones con Pseudo-Elementos

CSS3 Logo

¿Que son los Pseudo-Elementos? Este código muestra varios ejemplos de como usar los Pseudo-Elementos en los botones para dar un efecto a los selectores, que antes había que recurrir a métodos de sprite.

El HTML, simplemente sencillo.
[html]
<a href="#" class="boton">
Hazme Click!
</a>
[/html]

CSS Botón 1

[css]
.boton {
background-color:#ba2323;
padding:10px;
position:relative;
font-family: ‘Open Sans’, sans-serif;
font-size:12px;
text-decoration:none;
color:#fff;
border: solid 1px #831212;
background-image: linear-gradient(bottom, rgb(171,27,27) 0%, rgb(212,51,51) 100%);
border-radius: 5px;
}
.boton {
padding-bottom:9px;
padding-left:10px;
padding-right:10px;
padding-top:11px;
top:1px;
background-image: linear-gradient(bottom, rgb(171,27,27) 100%, rgb(212,51,51) 0%);
}
.boton::before {
background-color:#ccd0d5;
content:"";
display:block;
position:absolute;
width:100%;
height:100%;
padding:8px;
left:-8px;
top:-8px;
z-index:-1;
border-radius: 5px;
box-shadow: inset 0px 1px 1px #909193, 0px 1px 0px #fff;
}
[/css]

CSS Botón 2

[css]
.boton {
background-color:#6fba26;
padding:10px;
position:relative;
font-family: ‘Open Sans’, sans-serif;
font-size:12px;
text-decoration:none;
color:#fff;
background-image: linear-gradient(bottom, rgb(100,170,30) 0%, rgb(129,212,51) 100%);
box-shadow: inset 0px 1px 0px #b2f17f, 0px 6px 0px #3d6f0d;
border-radius: 5px;
}

.boton:active {
top:7px;
background-image: linear-gradient(bottom, rgb(100,170,30) 100%, rgb(129,212,51) 0%);
box-shadow: inset 0px 1px 0px #b2f17f, inset 0px -1px 0px #3d6f0d;
color: #156785;
text-shadow: 0px 1px 1px rgba(255,255,255,0.3);
background: rgb(44,160,202);
}
.boton::before {
background-color:#072239;
content:"";
display:block;
position:absolute;
width:100%;
height:100%;
padding-left:2px;
padding-right:2px;
padding-bottom:4px;
left:-2px;
top:5px;
z-index:-1;
border-radius: 6px;
box-shadow: 0px 1px 0px #fff;
}

.boton:active::before {
top:-2px;
}
[/css]

CSS Boton 3

[css]
.boton {
background-color:#3bb3e0;
font-family: ‘Open Sans’, sans-serif;
font-size:12px;
text-decoration:none;
color:#fff;
position:relative;
padding:10px 20px;
border-left:solid 1px #2ab7ec;
margin-left:35px;
background-image: linear-gradient(bottom, rgb(44,160,202) 0%, rgb(62,184,229) 100%);
border-top-right-radius: 5px;
border-bottom-right-radius: 5px;
box-shadow: inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #156785, 0px 10px 5px #999;
}

.boton:active {
top:3px;
background-image: linear-gradient(bottom, rgb(62,184,229) 0%, rgb(44,160,202) 100%);
box-shadow: inset 0px 1px 0px #2ab7ec, 0px 2px 0px 0px #156785, 0px 5px 3px #999;
}

.boton::before {
content:":-)";
width:35px;
max-height:29px;
height:100%;
position:absolute;
display:block;
padding-top:8px;
top:0px;
left:-36px;
font-size:16px;
font-weight:bold;
color:#8fd1ea;
text-shadow:1px 1px 0px #07526e;
border-right:solid 1px #07526e;
background-image: linear-gradient(bottom, rgb(10,94,125) 0%, rgb(14,139,184) 100%);
border-top-left-radius: 5px;
border-bottom-left-radius: 5px;
box-shadow:inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #032b3a, 0px 10px 5px #999 ;
}

.boton:active::before {
top:-3px;
box-shadow:inset 0px 1px 0px #2ab7ec, 0px 5px 0px 0px #032b3a, 1px 1px 0px 0px #044a64, 2px 2px 0px 0px #044a64, 2px 5px 0px 0px #044a64, 6px 4px 2px #0b698b, 0px 10px 5px #999 ;
}
[/css]

CSS Boton 4

[css]
.boton {
background-color:#9827d3;
width:150px;
display:inline-block;
font-family: ‘Open Sans’, sans-serif;
font-size:12px;
text-decoration:none;
color:#fff;
position:relative;
margin-top:40px;
padding-bottom:10px;
padding-top:10px;
background-image: linear-gradient(bottom, rgb(168,48,232) 100%, rgb(141,32,196) 0%);
border-bottom-right-radius: 5px;
border-bottom-left-radius: 5px;
box-shadow: inset 0px 1px 0px #ca73f8, 0px 5px 0px 0px #6a1099, 0px 10px 5px #999;
}

.boton:active {
top:3px;
background-image: linear-gradient(bottom, rgb(168,48,232) 0%, rgb(141,32,196) 100%);
box-shadow: inset 0px 4px 1px #7215a3, 0px 2px 0px 0px #6a1099, 0px 5px 3px #999;
}

.boton::before {
background-color:#fff;
background-image:url(image.png);
background-repeat:no-repeat;
background-position:center center;
border-left:solid 1px #CCC;
border-top:solid 1px #CCC;
border-right:solid 1px #CCC;
content:"";
width:148px;
height:40px;
position:absolute;
top:-30px;
left:0px;
margin-top:-11px;
z-index:-1;
border-top-left-radius: 5px;
border-top-right-radius: 5px;
}

.boton:active::before {
top: -33px;
box-shadow: 0px 3px 0px #ccc;
}
[/css]

Básico pero efectivo.

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