pxt-core/react-common/styles/controls/Icon.less

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i.far, i.fas {
    margin: 0 0.25rem 0 0;
    text-align: center;
    width: 1.81rem;
    line-height: inherit;
    font-size: 18px;
}

i.far.large, i.fas.large {
    font-size: 24px;
}