Hello, thanks for your purchase.
Please try adding the giver CSS code below at (css/custom.css):
.checkbox-custom input[type="checkbox"]:indeterminate + label:after {
position: absolute;
display: inline-block;
font-family: 'Font Awesome 5 Free';
font-weight: 900;
content: '\f068';
top: 50%;
left: 4px;
margin-top: -5px;
font-size: 11px;
line-height: 1;
width: 16px;
height: 16px;
color: #FFF;
}
Please try that and let us know if you need further assistance.
Kind Regards,
Rodrigo.
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