.wpcf7 input[type="text"],
.wpcf7 input[type="email"],
.wpcf7 input[type="tel"],
.wpcf7 textarea
{
    background-color: #222222;
    color: #fff;
    width: 100%;
    font-family: 'Open Sans';
    font-size: 18px;
    border: 1px solid #cccccc;
}
.wpcf7 
{
font-family: 'Open Sans', sans-serif;
}
#emailprincipal, #nombreprincipal, #telprincipal, #textoprincipal, #asuntoprincipal
{
background-color: #DDDDDD;
    color: #000;
    width: 100%;
    font-family: 'Open Sans';
    border: 1px solid #cccccc;
}