/*Borde container*/
 
 .custom-border {
      border: 3px solid black; 
   }
   
/*Borde select*/

/*slider*/


/* Para WebKit (Chrome, Safari, Opera) */
#slider.form-range-custom::-webkit-slider-thumb {
    background-color: #000000; 
    border: 1px solid #000000; 
    height: 20px; 
    width: 20px; 
}

/* Para Firefox */
#slider.form-range-custom::-moz-range-thumb {
    background-color: #000000; 
    border: 1px solid #000000; 
    height: 20px; 
    width: 20px; 
}