.boton-oscuro {
    background-color: #607d8b; /* blue-grey-500 */
    color: #ECEFF1; /*blue-grey-300*/
}
    
.boton-oscuro:hover {
    background-color: #90A4AE; /* blue-grey-300 */
    color: #ECEFF1; /*blue-grey-300*/
}

/*.panel-header {
    background-color: #607d8b;*/ /* blue-grey-500 */
    /*color: #ECEFF1;*/ /*blue-grey-300*/
/*}*/

#header_main {
    background: #37474F; /* md-bg-blue-grey-800 */
}


/*blue-grey-50 #ECEFF1
blue-grey-100 #CFD8DC
blue-grey-200 #B0BEC5
blue-grey-300 #90A4AE
blue-grey-400 #78909C
blue-grey-500 #607D8B
blue-grey-600 #546E7A
blue-grey-700 #455A64
blue-grey-800 #37474F
blue-grey-900 #263238*/