My task is to modify "tick" inside of the checkbox to "dash". I am new to css and so far I see that I need to modify this bit to have the "dash". I will appreciate if someone points me to documentation and suggest a solution which parameters can be used to do this.
input[type='checkbox'].input-checkbox {
&::before {
    border-bottom: 5px solid $charcoal;
    border-right: 5px solid $charcoal;
    content: '';
    height: 20px;
    left: 9px;
    opacity: 0;
    position: absolute;
    top: 2px;
    transform: rotate(45deg);
    transition: $transition-default;
    width: 11px;
    z-index: 1;
}
Thanks!
 
    