How can i make this?

[ush]

@ObbiGuy

.callout[data-callout="info"] {    
    border-left-width: 5px ;
    border-left-style: solid;
    border-left-color: #153c67;
    --callout-color: transparent;
}

.callout[data-callout="info"] .callout-title {
    background-color: #153c67;
}

I think --callout-color must be RGB value like 0, 0, 0 (correct me if I’m wrong)