.tec-icono{
    position: relative;
    display: inline-block;
    width: 1em;
    height: 1em;
    font-size: 1em;
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}
.tec-icono [class*="-lg"]{
    font-size: 1.6em;
}
.tec-icono [class*="-2x"]{
    font-size: 2em;
}
.tec-icono:before{
    content: '';
    display: inline-block;
    width: 100%;
    height: 100%;
    position: absolute;
    left: 0;
    top: 0;
    background-repeat: no-repeat;
    background-position: center;
    background-size: contain;
}
.tec-icono-flap:before {
    background-image: url(../images/iconos/flap_3.png);
}
.tec-icono-diamantados:before {
    background-image: url(../images/iconos/diamantados_3.png);
}
.tec-icono-sierrascirculares:before {
    background-image: url(../images/iconos/sierrascirculares_3.png);
}
.tec-icono-piedras:before {
    background-image: url(../images/iconos/piedras_3.png);
}
.tec-icono-pistola:before {
    background-image: url(../images/iconos/pistola_2.png);
}