.tit_formu {
    color: #000;
    font-size: 26px;
    margin-bottom: 30px;
    text-transform: uppercase;
}
.bloque_entrada {
    margin-bottom: 80px;
    margin-top: 100px;

}
.fondo_gris {

    box-shadow: 0 0 4px #777, 0 0 20px #ccc inset;
    position: relative;
}
.f_login {
    margin-bottom: 30px;
    margin-top: 30px;
    padding-left: 40px;
    padding-right: 40px;
}
.input-group-addon > i {
    color: #ffffff;
}
.bot_login {

    color: #ffffff;
    padding-left: 20px;
    padding-right: 20px;
    text-transform: uppercase;
}
form-horizontal .form-group {
    margin-left: 0;
    margin-right: 0;
}
.margen_superior{ margin-top: 20px;}
.zona_b{ margin-top: 30px; margin-bottom: 20px;}