src/platform/site-wide/header/components/OfficialGovtWebsite/styles.scss
.header-us-flag {
height: 20px;
}
.expand-official-govt-explanation {
font-size: 12px; // Smallest is vads-u-font-size--sm which is 15px.
}
.govt-expanded-arrow {
transform: rotate(180deg);
transform-origin: 50% 50%;
}