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.banner {
  height: 0;
  transform: translate(0, rem-calc(-24));
  border: rem-calc(24) red solid;
  border-left: rem-calc(24) transparent solid;
  border-right: rem-calc(24) transparent solid;
}
h2 {
  margin: 0;
  margin-top: rem-calc(-16);
  padding: rem-calc(0 8);
  text-align: center;
}