[role=listbox] {
    border: .2rem solid #000;
    list-style: none;
    margin: 0;
    padding: 0;
    font-weight: bold; 
    margin-left: 1rem;
    height: 20rem;
    overflow: auto;
}

[role=option] {
    cursor: pointer;
    padding: 1rem;
    border-bottom: .1rem solid #ddd;
    outline: none;
}

[role=option] label {
    top: -1rem;        
    border: 0!important;
}

[role=option]:last-child {
    border-bottom: 0;
}

[role=option][aria-selected=true] {
    background: #000;
    color: #fff;
}

[role=option].active  {
    background: #f16e00;
    color: #000;    
}

[role=option].active .o-checkbox[type="checkbox"]:checked + label::before {
    border-color: #e15e00 !important;    
}

[role=option].active .o-checkbox[type="checkbox"]:checked + label::after {
    background: transparent !important;
}

.o-checkbox[type="checkbox"]:not(:checked) + label::before, .o-checkbox[type="checkbox"]:checked + label::before {
    top: .5rem;
}

.o-checkbox[type="checkbox"]:not(:checked) + label::after, .o-checkbox[type="checkbox"]:checked + label::after {
    top: .5rem;
}