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// 1

:root {
  font-size: 12px;
}
@media (min-width: 768px) {
  :root {
    font-size: 14px;
  }
}
@media (min-width: 992px) {
  :root {
    font-size: 16px;
  }
}
@media (min-width: 1200px) {
  :root {
    font-size: 18px;
  }
}


// 2

.class {
  font-size: calc(1em + 1vw);
}