.paginacion button{
    width: 25px;
    height: 24px;
    border: none;
    cursor: pointer;

    background-size: cover;
    background-repeat: no-repeat;
    background-position: center center;
}
.paginacion .ir-a{
    background-image: url("../icon/programa/nav_ir.png");
}
.paginacion .ir-a:hover{
    background-image: url("../icon/programa/nav_ir_hover.png");
}

.paginacion .atras{
    background-image: url("../icon/programa/nav_previous_hover.png");
}
.paginacion .atras:hover{
    background-image: url("../icon/programa/nav_previous.png");
}

.paginacion .siguiente{
    background-image: url("../icon/programa/nav_next_hover.png");
}
.paginacion .siguiente:hover{
    background-image: url("../icon/programa/nav_next.png");
}