.contact_form h2 {
  background: none repeat scroll 0 0 #d02c07;
  border-radius: 5px;
  color: #fff;
  display: block;
  font-family: calibri;
  font-size: 20px;
  padding: 5px;
  text-shadow: 1px 1px 1px #CCCCCC;
  width: 433px;
}

/*— centrando el formulario —*/
.form
{
 padding:30px 0 10px 0 ;
 cursor:pointer;
 display:block;
 width:500px;
 margin: 0 auto;
 text-align:left;
}

/*— estilos para los ul y li del formulario —*/
.contact_form ul {
  width:500px;
  list-style-type:none;
  margin:0px;
  padding:0px;
}
.contact_form li{
  padding:12px; 
  border-bottom:1px solid #eee;
  position:relative;
} 
.contact_form label {
  color: #555555;
  display: inline-block;
  float: left;
  font-family: calibri;
  font-size: 13px;
  font-weight: bold;
  margin-top: 3px;
  padding: 3px;
  width: 90px;
}
.contact_form input {
  height:20px; 
  width:220px; 
  padding:5px 8px;
}
.contact_form textarea {
  padding:8px; 
  width:300px;
}
.contact_form button {
  margin-left:90px;
}

/*—– estilos visuales de los elementos ——–*/

.contact_form input, .contact_form textarea { 
  border:1px solid #aaa;
  box-shadow: 0px 0px 3px #ccc, 0 10px 15px #eee inset;
  border-radius:2px;
  color: #888;
  font-size: 12px;
  padding-right:30px;
  -moz-transition: padding .25s; 
  -webkit-transition: padding .25s; 
  -o-transition: padding .25s;
  transition: padding .25s;
}
.contact_form input:focus, .contact_form textarea:focus {
  background: #fff; 
  border:1px solid #555; 
  box-shadow: 0 0 3px #ff0000; 
  padding-right:80px;
}

/* === Estilos de Validacion === */ 

.contact_form input:required:valid, .contact_form textarea:required:valid {
  box-shadow: 0 0 5px #5cd053;
  border-color: #28921f;
}
.contact_form input:focus:invalid, .contact_form textarea:focus:invalid {
  box-shadow: 0 0 5px #d45252;
  border-color: #b03535
}

/* === Estilos del boton de Envio === */
button.submit {
  padding: 9px 17px;
  font-family: Helvetica,calibri, Arial, sans-serif;
  font-weight: bold;
  line-height: 1;
  color: #fff;
  border: none;
  text-shadow: 0 1px 1px rgba(255, 255, 255, 0.85);
  background-image: -webkit-gradient(linear, 0% 0%, 0% 100%, from(#fff), to(#bbb));
  background-image: -moz-linear-gradient(0% 100% 90deg, #BBBBBB, #FFFFFF);
  background: #d02c07;
  border: 1px solid #f1f1f1;
  border-radius: 10px;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}
button.submit:hover {
  opacity:.55;
  cursor: pointer; 
  color: #fff;
}
button.submit:active {
  border: 1px solid #222;
  box-shadow: 0 0 10px 5px #444 inset; 
}