.main-header {
  margin-top: 100px;
  margin-bottom: 100px;
}

h2 {
  font-size: 1.8em;
}

.sub-header {
  font-size: 2em;
  position: relative;
}

.sub-header::after {
  top: 0;
  left: 5vw;
}

.sub-header::before {
  top: 70px;
  right: 10px;
}

@media screen and (min-width: 540px) {
  .sub-header {
    font-size: 3em;
  }
}

@media screen and (min-width: 768px) {
  .sub-header {
    font-size: 3.2em;
  }
}

@media screen and (min-width: 1060px) {
  .sub-header {
    font-size: 3.6em;
  }

  .sub-header::after {
    width: 13vw;
    height: 13vw;
    left: 4vw;
  }

  .sub-header::before {
    width: 8vw;
    height: 8vw;
    right: 8vw;
    top: 22vh;
  }
}