Practicando con pseudoelementos!!!

body{
    font-family: 'Montserrat', sans-serif;
}

header {
    background-color: #BBBBBB;
    padding: 20px 0;
}

.caja{
    width: 940px;
    position: relative;
    margin: 0 auto;
}

nav {
    position: absolute;
    top: 110px;
    right: 0px;

}

nav li {
    display: inline;
    margin: 0 0 0 15px;
}

nav a {
    text-transform: uppercase;
    color: #000000;
    font-weight: bold;
    font-size: 22px;
    text-decoration: none;
}
nav a:hover{
    color: #c78c19;
    text-decoration: underline; 
}
.productos {
    width: 940px;
    margin: 0 auto;
    padding: 50px;
}
.productos li:hover{
    border-color: #c78c19;
}

.productos li:active{
    border-color: #088c19;
}

.productos li{
    display: inline-block;
    text-align: center;
    width: 30%;
    vertical-align: top;
    margin: 0 1.52%;
    padding: 30px 20px;
    box-sizing: border-box;
    border: 2px solid #000000;

    border-radius: 10px;
}
.productos h2 {
    font-size: 30px;
    font-weight: bold;
}
.productos li:hover h2{
    font-size: 33px;
}
.prudocuto-descripcion{
    font-size: 18px;
}
.producto-precio{
    font-size: 20px;
    font-weight: bold;
    margin-top: 10px;
}
footer {
    text-align: center;
    background: url(imagenes/bg.jpg);
    padding: 40px;
}
.copyright{
    color: #FFFFFF;
    font-size: 13px;
    margin: 20px;
}

form{
    margin: 40px 0;
}

form label, form legend{
    display: block;
    font-size: 20px;
    margin: 0 0 10px;

}

.input-padron{
    display: block;
    margin: 0 0 20px;
    padding: 10px 25px;
    width: 50%;
}

.checkbox{
    margin: 20px 0;
}

.enviar{
    width: 40%;
    padding: 15px 0;
    font-size: 18px;
    font-weight: bold;
    color: white;
    background: orange;
    border: none;
    border-radius: 5px;
    transition: 1s all;
    cursor: pointer;
}

.enviar:hover{
    background: red;
    transform: scale(1.2);
}

table{
    margin: 40px 40px;

}

thead{
    background: #555555;
    color: white;
    font-weight: bold;
}
td,th{
    border: 1px solid #000000;
    padding: 8px 15px;
}

/*CSS para nuestra home*/

.banner{
    width: 100%;
}

.principal{
    padding: 3em 0;
    background: #FFFFFF; 
    width: 940px;
    margin: 0 auto;
}

.titulo-principal{
    text-align: center;
    font-size: 2em;
    margin: 0 0 1em;
    clear:left;
}

.principal p{
    margin: 0 0 1em;
}

.principal strong{
    font-weight: bold;
}

.principal em {
    font-style: italic;
}

.utensillos {
    width: 120px;
    float:left;
    margin: 0 20px 20px 0;
}

.mapa{
    padding: 3em 0;
    background: linear-gradient(#FFFFFF, #888888)
}
.mapa p{
    margin: 0 0 2em;
    text-align: center;
}

.mapa-contenido{
    width: 940px;
    margin: 0 auto;
}


.diferenciales{
    padding: 3em;
    background: #888888;
}

.contenido-diferenciales{
    width: 640px;
    margin: 0 auto;
}

.lista-diferenciales{
    width: 40%;
    display: inline-block;
    vertical-align: top;
}

.items{
    line-height: 1.5;
}

.items:before{
    content: "➠"
}

.items:first-child{
    font-weight: bold;
}

.imagen-diferenciales{
    width: 60%;

}

.video{
    width: 560px;
    margin: 1em auto;
}